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Internet Protocols and Support</a> &#187;</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-smtplib"> <span id="smtplib-smtp-protocol-client"></span><h1>20.12. <a class="reference internal" href="#module-smtplib" title="smtplib: SMTP protocol client (requires sockets)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">smtplib</span></code></a> — SMTP protocol client<a class="headerlink" href="#module-smtplib" title="Permalink to this headline">¶</a></h1> <p id="index-0"><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/2.7/Lib/smtplib.py">Lib/smtplib.py</a></p> <hr class="docutils" /> <p>The <a class="reference internal" href="#module-smtplib" title="smtplib: SMTP protocol client (requires sockets)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">smtplib</span></code></a> module defines an SMTP client session object that can be used to send mail to any Internet machine with an SMTP or ESMTP listener daemon. For details of SMTP and ESMTP operation, consult <span class="target" id="index-1"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc821.html"><strong>RFC 821</strong></a> (Simple Mail Transfer Protocol) and <span class="target" id="index-2"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc1869.html"><strong>RFC 1869</strong></a> (SMTP Service Extensions).</p> <dl class="class"> <dt id="smtplib.SMTP"> <em class="property">class </em><code class="descclassname">smtplib.</code><code class="descname">SMTP</code><span class="sig-paren">(</span><span class="optional">[</span><em>host</em><span class="optional">[</span>, <em>port</em><span class="optional">[</span>, <em>local_hostname</em><span class="optional">[</span>, <em>timeout</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP" title="Permalink to this definition">¶</a></dt> <dd><p>An <a class="reference internal" href="#smtplib.SMTP" title="smtplib.SMTP"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP</span></code></a> instance encapsulates an SMTP connection. It has methods that support a full repertoire of SMTP and ESMTP operations. If the optional host and port parameters are given, the SMTP <a class="reference internal" href="#smtplib.SMTP.connect" title="smtplib.SMTP.connect"><code class="xref py py-meth docutils literal notranslate"><span class="pre">connect()</span></code></a> method is called with those parameters during initialization. If specified, <em>local_hostname</em> is used as the FQDN of the local host in the HELO/EHLO command. Otherwise, the local hostname is found using <a class="reference internal" href="socket.html#socket.getfqdn" title="socket.getfqdn"><code class="xref py py-func docutils literal notranslate"><span class="pre">socket.getfqdn()</span></code></a>. If the <a class="reference internal" href="#smtplib.SMTP.connect" title="smtplib.SMTP.connect"><code class="xref py py-meth docutils literal notranslate"><span class="pre">connect()</span></code></a> call returns anything other than a success code, an <a class="reference internal" href="#smtplib.SMTPConnectError" title="smtplib.SMTPConnectError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPConnectError</span></code></a> is raised. The optional <em>timeout</em> parameter specifies a timeout in seconds for blocking operations like the connection attempt (if not specified, the global default timeout setting will be used). If the timeout expires, <a class="reference internal" href="socket.html#socket.timeout" title="socket.timeout"><code class="xref py py-exc docutils literal notranslate"><span class="pre">socket.timeout</span></code></a> is raised.</p> <p>For normal use, you should only require the initialization/connect, <a class="reference internal" href="#smtplib.SMTP.sendmail" title="smtplib.SMTP.sendmail"><code class="xref py py-meth docutils literal notranslate"><span class="pre">sendmail()</span></code></a>, and <a class="reference internal" href="#smtplib.SMTP.quit" title="smtplib.SMTP.quit"><code class="xref py py-meth docutils literal notranslate"><span class="pre">SMTP.quit()</span></code></a> methods. An example is included below.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6: </span><em>timeout</em> was added.</p> </div> </dd></dl> <dl class="class"> <dt id="smtplib.SMTP_SSL"> <em class="property">class </em><code class="descclassname">smtplib.</code><code class="descname">SMTP_SSL</code><span class="sig-paren">(</span><span class="optional">[</span><em>host</em><span class="optional">[</span>, <em>port</em><span class="optional">[</span>, <em>local_hostname</em><span class="optional">[</span>, <em>keyfile</em><span class="optional">[</span>, <em>certfile</em><span class="optional">[</span>, <em>timeout</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP_SSL" title="Permalink to this definition">¶</a></dt> <dd><p>An <a class="reference internal" href="#smtplib.SMTP_SSL" title="smtplib.SMTP_SSL"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP_SSL</span></code></a> instance behaves exactly the same as instances of <a class="reference internal" href="#smtplib.SMTP" title="smtplib.SMTP"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP</span></code></a>. <a class="reference internal" href="#smtplib.SMTP_SSL" title="smtplib.SMTP_SSL"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP_SSL</span></code></a> should be used for situations where SSL is required from the beginning of the connection and using <code class="xref py py-meth docutils literal notranslate"><span class="pre">starttls()</span></code> is not appropriate. If <em>host</em> is not specified, the local host is used. If <em>port</em> is omitted, the standard SMTP-over-SSL port (465) is used. <em>local_hostname</em> has the same meaning as it does for the <a class="reference internal" href="#smtplib.SMTP" title="smtplib.SMTP"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP</span></code></a> class. <em>keyfile</em> and <em>certfile</em> are also optional, and can contain a PEM formatted private key and certificate chain file for the SSL connection. The optional <em>timeout</em> parameter specifies a timeout in seconds for blocking operations like the connection attempt (if not specified, the global default timeout setting will be used). If the timeout expires, <a class="reference internal" href="socket.html#socket.timeout" title="socket.timeout"><code class="xref py py-exc docutils literal notranslate"><span class="pre">socket.timeout</span></code></a> is raised.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="class"> <dt id="smtplib.LMTP"> <em class="property">class </em><code class="descclassname">smtplib.</code><code class="descname">LMTP</code><span class="sig-paren">(</span><span class="optional">[</span><em>host</em><span class="optional">[</span>, <em>port</em><span class="optional">[</span>, <em>local_hostname</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.LMTP" title="Permalink to this definition">¶</a></dt> <dd><p>The LMTP protocol, which is very similar to ESMTP, is heavily based on the standard SMTP client. It’s common to use Unix sockets for LMTP, so our <code class="xref py py-meth docutils literal notranslate"><span class="pre">connect()</span></code> method must support that as well as a regular host:port server. <em>local_hostname</em> has the same meaning as it does for the <a class="reference internal" href="#smtplib.SMTP" title="smtplib.SMTP"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP</span></code></a> class. To specify a Unix socket, you must use an absolute path for <em>host</em>, starting with a ‘/’.</p> <p>Authentication is supported, using the regular SMTP mechanism. When using a Unix socket, LMTP generally don’t support or require any authentication, but your mileage might vary.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <p>A nice selection of exceptions is defined as well:</p> <dl class="exception"> <dt id="smtplib.SMTPException"> <em class="property">exception </em><code class="descclassname">smtplib.</code><code class="descname">SMTPException</code><a class="headerlink" href="#smtplib.SMTPException" title="Permalink to this definition">¶</a></dt> <dd><p>The base exception class for all the other exceptions provided by this module.</p> </dd></dl> <dl class="exception"> <dt id="smtplib.SMTPServerDisconnected"> <em class="property">exception </em><code class="descclassname">smtplib.</code><code class="descname">SMTPServerDisconnected</code><a class="headerlink" href="#smtplib.SMTPServerDisconnected" title="Permalink to this definition">¶</a></dt> <dd><p>This exception is raised when the server unexpectedly disconnects, or when an attempt is made to use the <a class="reference internal" href="#smtplib.SMTP" title="smtplib.SMTP"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP</span></code></a> instance before connecting it to a server.</p> </dd></dl> <dl class="exception"> <dt id="smtplib.SMTPResponseException"> <em class="property">exception </em><code class="descclassname">smtplib.</code><code class="descname">SMTPResponseException</code><a class="headerlink" href="#smtplib.SMTPResponseException" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for all exceptions that include an SMTP error code. These exceptions are generated in some instances when the SMTP server returns an error code. The error code is stored in the <code class="xref py py-attr docutils literal notranslate"><span class="pre">smtp_code</span></code> attribute of the error, and the <code class="xref py py-attr docutils literal notranslate"><span class="pre">smtp_error</span></code> attribute is set to the error message.</p> </dd></dl> <dl class="exception"> <dt id="smtplib.SMTPSenderRefused"> <em class="property">exception </em><code class="descclassname">smtplib.</code><code class="descname">SMTPSenderRefused</code><a class="headerlink" href="#smtplib.SMTPSenderRefused" title="Permalink to this definition">¶</a></dt> <dd><p>Sender address refused. In addition to the attributes set by on all <a class="reference internal" href="#smtplib.SMTPResponseException" title="smtplib.SMTPResponseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPResponseException</span></code></a> exceptions, this sets ‘sender’ to the string that the SMTP server refused.</p> </dd></dl> <dl class="exception"> <dt id="smtplib.SMTPRecipientsRefused"> <em class="property">exception </em><code class="descclassname">smtplib.</code><code class="descname">SMTPRecipientsRefused</code><a class="headerlink" href="#smtplib.SMTPRecipientsRefused" title="Permalink to this definition">¶</a></dt> <dd><p>All recipient addresses refused. The errors for each recipient are accessible through the attribute <code class="xref py py-attr docutils literal notranslate"><span class="pre">recipients</span></code>, which is a dictionary of exactly the same sort as <a class="reference internal" href="#smtplib.SMTP.sendmail" title="smtplib.SMTP.sendmail"><code class="xref py py-meth docutils literal notranslate"><span class="pre">SMTP.sendmail()</span></code></a> returns.</p> </dd></dl> <dl class="exception"> <dt id="smtplib.SMTPDataError"> <em class="property">exception </em><code class="descclassname">smtplib.</code><code class="descname">SMTPDataError</code><a class="headerlink" href="#smtplib.SMTPDataError" title="Permalink to this definition">¶</a></dt> <dd><p>The SMTP server refused to accept the message data.</p> </dd></dl> <dl class="exception"> <dt id="smtplib.SMTPConnectError"> <em class="property">exception </em><code class="descclassname">smtplib.</code><code class="descname">SMTPConnectError</code><a class="headerlink" href="#smtplib.SMTPConnectError" title="Permalink to this definition">¶</a></dt> <dd><p>Error occurred during establishment of a connection with the server.</p> </dd></dl> <dl class="exception"> <dt id="smtplib.SMTPHeloError"> <em class="property">exception </em><code class="descclassname">smtplib.</code><code class="descname">SMTPHeloError</code><a class="headerlink" href="#smtplib.SMTPHeloError" title="Permalink to this definition">¶</a></dt> <dd><p>The server refused our <code class="docutils literal notranslate"><span class="pre">HELO</span></code> message.</p> </dd></dl> <dl class="exception"> <dt id="smtplib.SMTPAuthenticationError"> <em class="property">exception </em><code class="descclassname">smtplib.</code><code class="descname">SMTPAuthenticationError</code><a class="headerlink" href="#smtplib.SMTPAuthenticationError" title="Permalink to this definition">¶</a></dt> <dd><p>SMTP authentication went wrong. Most probably the server didn’t accept the username/password combination provided.</p> </dd></dl> <div class="admonition seealso"> <p class="first admonition-title">See also</p> <dl class="last docutils"> <dt><span class="target" id="index-3"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc821.html"><strong>RFC 821</strong></a> - Simple Mail Transfer Protocol</dt> <dd>Protocol definition for SMTP. This document covers the model, operating procedure, and protocol details for SMTP.</dd> <dt><span class="target" id="index-4"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc1869.html"><strong>RFC 1869</strong></a> - SMTP Service Extensions</dt> <dd>Definition of the ESMTP extensions for SMTP. This describes a framework for extending SMTP with new commands, supporting dynamic discovery of the commands provided by the server, and defines a few additional commands.</dd> </dl> </div> <div class="section" id="smtp-objects"> <span id="id1"></span><h2>20.12.1. SMTP Objects<a class="headerlink" href="#smtp-objects" title="Permalink to this headline">¶</a></h2> <p>An <a class="reference internal" href="#smtplib.SMTP" title="smtplib.SMTP"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP</span></code></a> instance has the following methods:</p> <dl class="method"> <dt id="smtplib.SMTP.set_debuglevel"> <code class="descclassname">SMTP.</code><code class="descname">set_debuglevel</code><span class="sig-paren">(</span><em>level</em><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.set_debuglevel" title="Permalink to this definition">¶</a></dt> <dd><p>Set the debug output level. A true value for <em>level</em> results in debug messages for connection and for all messages sent to and received from the server.</p> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.docmd"> <code class="descclassname">SMTP.</code><code class="descname">docmd</code><span class="sig-paren">(</span><em>cmd</em><span class="optional">[</span>, <em>argstring</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.docmd" title="Permalink to this definition">¶</a></dt> <dd><p>Send a command <em>cmd</em> to the server. The optional argument <em>argstring</em> is simply concatenated to the command, separated by a space.</p> <p>This returns a 2-tuple composed of a numeric response code and the actual response line (multiline responses are joined into one long line.)</p> <p>In normal operation it should not be necessary to call this method explicitly. It is used to implement other methods and may be useful for testing private extensions.</p> <p>If the connection to the server is lost while waiting for the reply, <a class="reference internal" href="#smtplib.SMTPServerDisconnected" title="smtplib.SMTPServerDisconnected"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPServerDisconnected</span></code></a> will be raised.</p> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.connect"> <code class="descclassname">SMTP.</code><code class="descname">connect</code><span class="sig-paren">(</span><span class="optional">[</span><em>host</em><span class="optional">[</span>, <em>port</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.connect" title="Permalink to this definition">¶</a></dt> <dd><p>Connect to a host on a given port. The defaults are to connect to the local host at the standard SMTP port (25). If the hostname ends with a colon (<code class="docutils literal notranslate"><span class="pre">':'</span></code>) followed by a number, that suffix will be stripped off and the number interpreted as the port number to use. This method is automatically invoked by the constructor if a host is specified during instantiation. Returns a 2-tuple of the response code and message sent by the server in its connection response.</p> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.helo"> <code class="descclassname">SMTP.</code><code class="descname">helo</code><span class="sig-paren">(</span><span class="optional">[</span><em>hostname</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.helo" title="Permalink to this definition">¶</a></dt> <dd><p>Identify yourself to the SMTP server using <code class="docutils literal notranslate"><span class="pre">HELO</span></code>. The hostname argument defaults to the fully qualified domain name of the local host. The message returned by the server is stored as the <code class="xref py py-attr docutils literal notranslate"><span class="pre">helo_resp</span></code> attribute of the object.</p> <p>In normal operation it should not be necessary to call this method explicitly. It will be implicitly called by the <a class="reference internal" href="#smtplib.SMTP.sendmail" title="smtplib.SMTP.sendmail"><code class="xref py py-meth docutils literal notranslate"><span class="pre">sendmail()</span></code></a> when necessary.</p> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.ehlo"> <code class="descclassname">SMTP.</code><code class="descname">ehlo</code><span class="sig-paren">(</span><span class="optional">[</span><em>hostname</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.ehlo" title="Permalink to this definition">¶</a></dt> <dd><p>Identify yourself to an ESMTP server using <code class="docutils literal notranslate"><span class="pre">EHLO</span></code>. The hostname argument defaults to the fully qualified domain name of the local host. Examine the response for ESMTP option and store them for use by <a class="reference internal" href="#smtplib.SMTP.has_extn" title="smtplib.SMTP.has_extn"><code class="xref py py-meth docutils literal notranslate"><span class="pre">has_extn()</span></code></a>. Also sets several informational attributes: the message returned by the server is stored as the <code class="xref py py-attr docutils literal notranslate"><span class="pre">ehlo_resp</span></code> attribute, <code class="xref py py-attr docutils literal notranslate"><span class="pre">does_esmtp</span></code> is set to true or false depending on whether the server supports ESMTP, and <code class="xref py py-attr docutils literal notranslate"><span class="pre">esmtp_features</span></code> will be a dictionary containing the names of the SMTP service extensions this server supports, and their parameters (if any).</p> <p>Unless you wish to use <a class="reference internal" href="#smtplib.SMTP.has_extn" title="smtplib.SMTP.has_extn"><code class="xref py py-meth docutils literal notranslate"><span class="pre">has_extn()</span></code></a> before sending mail, it should not be necessary to call this method explicitly. It will be implicitly called by <a class="reference internal" href="#smtplib.SMTP.sendmail" title="smtplib.SMTP.sendmail"><code class="xref py py-meth docutils literal notranslate"><span class="pre">sendmail()</span></code></a> when necessary.</p> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.ehlo_or_helo_if_needed"> <code class="descclassname">SMTP.</code><code class="descname">ehlo_or_helo_if_needed</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.ehlo_or_helo_if_needed" title="Permalink to this definition">¶</a></dt> <dd><p>This method call <a class="reference internal" href="#smtplib.SMTP.ehlo" title="smtplib.SMTP.ehlo"><code class="xref py py-meth docutils literal notranslate"><span class="pre">ehlo()</span></code></a> and or <a class="reference internal" href="#smtplib.SMTP.helo" title="smtplib.SMTP.helo"><code class="xref py py-meth docutils literal notranslate"><span class="pre">helo()</span></code></a> if there has been no previous <code class="docutils literal notranslate"><span class="pre">EHLO</span></code> or <code class="docutils literal notranslate"><span class="pre">HELO</span></code> command this session. It tries ESMTP <code class="docutils literal notranslate"><span class="pre">EHLO</span></code> first.</p> <dl class="docutils"> <dt><a class="reference internal" href="#smtplib.SMTPHeloError" title="smtplib.SMTPHeloError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPHeloError</span></code></a></dt> <dd>The server didn’t reply properly to the <code class="docutils literal notranslate"><span class="pre">HELO</span></code> greeting.</dd> </dl> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.has_extn"> <code class="descclassname">SMTP.</code><code class="descname">has_extn</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.has_extn" title="Permalink to this definition">¶</a></dt> <dd><p>Return <a class="reference internal" href="constants.html#True" title="True"><code class="xref py py-const docutils literal notranslate"><span class="pre">True</span></code></a> if <em>name</em> is in the set of SMTP service extensions returned by the server, <a class="reference internal" href="constants.html#False" title="False"><code class="xref py py-const docutils literal notranslate"><span class="pre">False</span></code></a> otherwise. Case is ignored.</p> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.verify"> <code class="descclassname">SMTP.</code><code class="descname">verify</code><span class="sig-paren">(</span><em>address</em><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.verify" title="Permalink to this definition">¶</a></dt> <dd><p>Check the validity of an address on this server using SMTP <code class="docutils literal notranslate"><span class="pre">VRFY</span></code>. Returns a tuple consisting of code 250 and a full <span class="target" id="index-5"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc822.html"><strong>RFC 822</strong></a> address (including human name) if the user address is valid. Otherwise returns an SMTP error code of 400 or greater and an error string.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">Many sites disable SMTP <code class="docutils literal notranslate"><span class="pre">VRFY</span></code> in order to foil spammers.</p> </div> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.login"> <code class="descclassname">SMTP.</code><code class="descname">login</code><span class="sig-paren">(</span><em>user</em>, <em>password</em><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.login" title="Permalink to this definition">¶</a></dt> <dd><p>Log in on an SMTP server that requires authentication. The arguments are the username and the password to authenticate with. If there has been no previous <code class="docutils literal notranslate"><span class="pre">EHLO</span></code> or <code class="docutils literal notranslate"><span class="pre">HELO</span></code> command this session, this method tries ESMTP <code class="docutils literal notranslate"><span class="pre">EHLO</span></code> first. This method will return normally if the authentication was successful, or may raise the following exceptions:</p> <dl class="docutils"> <dt><a class="reference internal" href="#smtplib.SMTPHeloError" title="smtplib.SMTPHeloError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPHeloError</span></code></a></dt> <dd>The server didn’t reply properly to the <code class="docutils literal notranslate"><span class="pre">HELO</span></code> greeting.</dd> <dt><a class="reference internal" href="#smtplib.SMTPAuthenticationError" title="smtplib.SMTPAuthenticationError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPAuthenticationError</span></code></a></dt> <dd>The server didn’t accept the username/password combination.</dd> <dt><a class="reference internal" href="#smtplib.SMTPException" title="smtplib.SMTPException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPException</span></code></a></dt> <dd>No suitable authentication method was found.</dd> </dl> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.starttls"> <code class="descclassname">SMTP.</code><code class="descname">starttls</code><span class="sig-paren">(</span><span class="optional">[</span><em>keyfile</em><span class="optional">[</span>, <em>certfile</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.starttls" title="Permalink to this definition">¶</a></dt> <dd><p>Put the SMTP connection in TLS (Transport Layer Security) mode. All SMTP commands that follow will be encrypted. You should then call <a class="reference internal" href="#smtplib.SMTP.ehlo" title="smtplib.SMTP.ehlo"><code class="xref py py-meth docutils literal notranslate"><span class="pre">ehlo()</span></code></a> again.</p> <p>If <em>keyfile</em> and <em>certfile</em> are provided, these are passed to the <a class="reference internal" href="socket.html#module-socket" title="socket: Low-level networking interface."><code class="xref py py-mod docutils literal notranslate"><span class="pre">socket</span></code></a> module’s <a class="reference internal" href="ssl.html#module-ssl" title="ssl: TLS/SSL wrapper for socket objects"><code class="xref py py-func docutils literal notranslate"><span class="pre">ssl()</span></code></a> function.</p> <p>If there has been no previous <code class="docutils literal notranslate"><span class="pre">EHLO</span></code> or <code class="docutils literal notranslate"><span class="pre">HELO</span></code> command this session, this method tries ESMTP <code class="docutils literal notranslate"><span class="pre">EHLO</span></code> first.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6.</span></p> </div> <dl class="docutils"> <dt><a class="reference internal" href="#smtplib.SMTPHeloError" title="smtplib.SMTPHeloError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPHeloError</span></code></a></dt> <dd>The server didn’t reply properly to the <code class="docutils literal notranslate"><span class="pre">HELO</span></code> greeting.</dd> <dt><a class="reference internal" href="#smtplib.SMTPException" title="smtplib.SMTPException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPException</span></code></a></dt> <dd>The server does not support the STARTTLS extension.</dd> </dl> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6.</span></p> </div> <dl class="docutils"> <dt><a class="reference internal" href="exceptions.html#exceptions.RuntimeError" title="exceptions.RuntimeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">RuntimeError</span></code></a></dt> <dd>SSL/TLS support is not available to your Python interpreter.</dd> </dl> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.sendmail"> <code class="descclassname">SMTP.</code><code class="descname">sendmail</code><span class="sig-paren">(</span><em>from_addr</em>, <em>to_addrs</em>, <em>msg</em><span class="optional">[</span>, <em>mail_options</em>, <em>rcpt_options</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.sendmail" title="Permalink to this definition">¶</a></dt> <dd><p>Send mail. The required arguments are an <span class="target" id="index-6"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc822.html"><strong>RFC 822</strong></a> from-address string, a list of <span class="target" id="index-7"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc822.html"><strong>RFC 822</strong></a> to-address strings (a bare string will be treated as a list with 1 address), and a message string. The caller may pass a list of ESMTP options (such as <code class="docutils literal notranslate"><span class="pre">8bitmime</span></code>) to be used in <code class="docutils literal notranslate"><span class="pre">MAIL</span> <span class="pre">FROM</span></code> commands as <em>mail_options</em>. ESMTP options (such as <code class="docutils literal notranslate"><span class="pre">DSN</span></code> commands) that should be used with all <code class="docutils literal notranslate"><span class="pre">RCPT</span></code> commands can be passed as <em>rcpt_options</em>. (If you need to use different ESMTP options to different recipients you have to use the low-level methods such as <code class="xref py py-meth docutils literal notranslate"><span class="pre">mail()</span></code>, <code class="xref py py-meth docutils literal notranslate"><span class="pre">rcpt()</span></code> and <code class="xref py py-meth docutils literal notranslate"><span class="pre">data()</span></code> to send the message.)</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">The <em>from_addr</em> and <em>to_addrs</em> parameters are used to construct the message envelope used by the transport agents. The <a class="reference internal" href="#smtplib.SMTP" title="smtplib.SMTP"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP</span></code></a> does not modify the message headers in any way.</p> </div> <p>If there has been no previous <code class="docutils literal notranslate"><span class="pre">EHLO</span></code> or <code class="docutils literal notranslate"><span class="pre">HELO</span></code> command this session, this method tries ESMTP <code class="docutils literal notranslate"><span class="pre">EHLO</span></code> first. If the server does ESMTP, message size and each of the specified options will be passed to it (if the option is in the feature set the server advertises). If <code class="docutils literal notranslate"><span class="pre">EHLO</span></code> fails, <code class="docutils literal notranslate"><span class="pre">HELO</span></code> will be tried and ESMTP options suppressed.</p> <p>This method will return normally if the mail is accepted for at least one recipient. Otherwise it will raise an exception. That is, if this method does not raise an exception, then someone should get your mail. If this method does not raise an exception, it returns a dictionary, with one entry for each recipient that was refused. Each entry contains a tuple of the SMTP error code and the accompanying error message sent by the server.</p> <p>This method may raise the following exceptions:</p> <dl class="docutils"> <dt><a class="reference internal" href="#smtplib.SMTPRecipientsRefused" title="smtplib.SMTPRecipientsRefused"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPRecipientsRefused</span></code></a></dt> <dd>All recipients were refused. Nobody got the mail. The <code class="xref py py-attr docutils literal notranslate"><span class="pre">recipients</span></code> attribute of the exception object is a dictionary with information about the refused recipients (like the one returned when at least one recipient was accepted).</dd> <dt><a class="reference internal" href="#smtplib.SMTPHeloError" title="smtplib.SMTPHeloError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPHeloError</span></code></a></dt> <dd>The server didn’t reply properly to the <code class="docutils literal notranslate"><span class="pre">HELO</span></code> greeting.</dd> <dt><a class="reference internal" href="#smtplib.SMTPSenderRefused" title="smtplib.SMTPSenderRefused"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPSenderRefused</span></code></a></dt> <dd>The server didn’t accept the <em>from_addr</em>.</dd> <dt><a class="reference internal" href="#smtplib.SMTPDataError" title="smtplib.SMTPDataError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SMTPDataError</span></code></a></dt> <dd>The server replied with an unexpected error code (other than a refusal of a recipient).</dd> </dl> <p>Unless otherwise noted, the connection will be open even after an exception is raised.</p> </dd></dl> <dl class="method"> <dt id="smtplib.SMTP.quit"> <code class="descclassname">SMTP.</code><code class="descname">quit</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#smtplib.SMTP.quit" title="Permalink to this definition">¶</a></dt> <dd><p>Terminate the SMTP session and close the connection. Return the result of the SMTP <code class="docutils literal notranslate"><span class="pre">QUIT</span></code> command.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6: </span>Return a value.</p> </div> </dd></dl> <p>Low-level methods corresponding to the standard SMTP/ESMTP commands <code class="docutils literal notranslate"><span class="pre">HELP</span></code>, <code class="docutils literal notranslate"><span class="pre">RSET</span></code>, <code class="docutils literal notranslate"><span class="pre">NOOP</span></code>, <code class="docutils literal notranslate"><span class="pre">MAIL</span></code>, <code class="docutils literal notranslate"><span class="pre">RCPT</span></code>, and <code class="docutils literal notranslate"><span class="pre">DATA</span></code> are also supported. Normally these do not need to be called directly, so they are not documented here. For details, consult the module code.</p> </div> <div class="section" id="smtp-example"> <span id="id2"></span><h2>20.12.2. SMTP Example<a class="headerlink" href="#smtp-example" title="Permalink to this headline">¶</a></h2> <p>This example prompts the user for addresses needed in the message envelope (‘To’ and ‘From’ addresses), and the message to be delivered. Note that the headers to be included with the message must be included in the message as entered; this example doesn’t do any processing of the <span class="target" id="index-8"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc822.html"><strong>RFC 822</strong></a> headers. In particular, the ‘To’ and ‘From’ addresses must be included in the message headers explicitly.</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">smtplib</span> <span class="k">def</span> <span class="nf">prompt</span><span class="p">(</span><span class="n">prompt</span><span class="p">):</span> <span class="k">return</span> <span class="n">raw_input</span><span class="p">(</span><span class="n">prompt</span><span class="p">)</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span> <span class="n">fromaddr</span> <span class="o">=</span> <span class="n">prompt</span><span class="p">(</span><span class="s2">&quot;From: &quot;</span><span class="p">)</span> <span class="n">toaddrs</span> <span class="o">=</span> <span class="n">prompt</span><span class="p">(</span><span class="s2">&quot;To: &quot;</span><span class="p">)</span><span class="o">.</span><span class="n">split</span><span class="p">()</span> <span class="nb">print</span> <span class="s2">&quot;Enter message, end with ^D (Unix) or ^Z (Windows):&quot;</span> <span class="c1"># Add the From: and To: headers at the start!</span> <span class="n">msg</span> <span class="o">=</span> <span class="p">(</span><span class="s2">&quot;From: </span><span class="si">%s</span><span class="se">\r\n</span><span class="s2">To: </span><span class="si">%s</span><span class="se">\r\n\r\n</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">fromaddr</span><span class="p">,</span> <span class="s2">&quot;, &quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">toaddrs</span><span class="p">)))</span> <span class="k">while</span> <span class="mi">1</span><span class="p">:</span> <span class="k">try</span><span class="p">:</span> <span class="n">line</span> <span class="o">=</span> <span class="n">raw_input</span><span class="p">()</span> <span class="k">except</span> <span class="ne">EOFError</span><span class="p">:</span> <span class="k">break</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">line</span><span class="p">:</span> <span class="k">break</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">msg</span> <span class="o">+</span> <span class="n">line</span> <span class="nb">print</span> <span class="s2">&quot;Message length is &quot;</span> <span class="o">+</span> <span class="nb">repr</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">msg</span><span class="p">))</span> <span class="n">server</span> <span class="o">=</span> <span class="n">smtplib</span><span class="o">.</span><span class="n">SMTP</span><span class="p">(</span><span class="s1">&#39;localhost&#39;</span><span class="p">)</span> <span class="n">server</span><span class="o">.</span><span class="n">set_debuglevel</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="n">server</span><span class="o">.</span><span class="n">sendmail</span><span class="p">(</span><span class="n">fromaddr</span><span class="p">,</span> <span class="n">toaddrs</span><span class="p">,</span> <span class="n">msg</span><span class="p">)</span> <span class="n">server</span><span class="o">.</span><span class="n">quit</span><span class="p">()</span> </pre></div> </div> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">In general, you will want to use the <a class="reference internal" href="email.html#module-email" title="email: Package supporting the parsing, manipulating, and generating email messages, including MIME documents."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email</span></code></a> package’s features to construct an email message, which you can then convert to a string and send via <code class="xref py py-meth docutils literal notranslate"><span class="pre">sendmail()</span></code>; see <a class="reference internal" href="email-examples.html#email-examples"><span class="std std-ref">email: Examples</span></a>.</p> </div> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">20.12. <code class="docutils literal notranslate"><span class="pre">smtplib</span></code> — SMTP protocol client</a><ul> <li><a class="reference internal" href="#smtp-objects">20.12.1. SMTP Objects</a></li> <li><a class="reference internal" href="#smtp-example">20.12.2. 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