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<div class="section" id="module-email.mime">
<span id="email-mime-creating-email-and-mime-objects-from-scratch"></span><h1>19.1.10. <a class="reference internal" href="#module-email.mime" title="email.mime: Build MIME messages."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.mime</span></code></a>: Creating email and MIME objects from scratch<a class="headerlink" href="#module-email.mime" title="Permalink to this headline">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.6/Lib/email/mime/">Lib/email/mime/</a></p>
<hr class="docutils" />
<p>This module is part of the legacy (<code class="docutils literal notranslate"><span class="pre">Compat32</span></code>) email API. Its functionality
is partially replaced by the <a class="reference internal" href="email.contentmanager.html#module-email.contentmanager" title="email.contentmanager: Storing and Retrieving Content from MIME Parts"><code class="xref py py-mod docutils literal notranslate"><span class="pre">contentmanager</span></code></a> in the new API, but
in certain applications these classes may still be useful, even in non-legacy
code.</p>
<p>Ordinarily, you get a message object structure by passing a file or some text to
a parser, which parses the text and returns the root message object. However
you can also build a complete message structure from scratch, or even individual
<a class="reference internal" href="email.compat32-message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> objects by hand. In fact, you can also take an
existing structure and add new <a class="reference internal" href="email.compat32-message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> objects, move them
around, etc. This makes a very convenient interface for slicing-and-dicing MIME
messages.</p>
<p>You can create a new object structure by creating <a class="reference internal" href="email.compat32-message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a>
instances, adding attachments and all the appropriate headers manually. For MIME
messages though, the <a class="reference internal" href="email.html#module-email" title="email: Package supporting the parsing, manipulating, and generating email messages."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email</span></code></a> package provides some convenient subclasses to
make things easier.</p>
<p>Here are the classes:</p>
<dl class="class">
<dt id="email.mime.base.MIMEBase">
<em class="property">class </em><code class="descclassname">email.mime.base.</code><code class="descname">MIMEBase</code><span class="sig-paren">(</span><em>_maintype</em>, <em>_subtype</em>, <em>*</em>, <em>policy=compat32</em>, <em>**_params</em><span class="sig-paren">)</span><a class="headerlink" href="#email.mime.base.MIMEBase" title="Permalink to this definition">¶</a></dt>
<dd><p>Module: <code class="xref py py-mod docutils literal notranslate"><span class="pre">email.mime.base</span></code></p>
<p>This is the base class for all the MIME-specific subclasses of
<a class="reference internal" href="email.compat32-message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a>. Ordinarily you won’t create instances
specifically of <a class="reference internal" href="#email.mime.base.MIMEBase" title="email.mime.base.MIMEBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEBase</span></code></a>, although you could. <a class="reference internal" href="#email.mime.base.MIMEBase" title="email.mime.base.MIMEBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEBase</span></code></a>
is provided primarily as a convenient base class for more specific
MIME-aware subclasses.</p>
<p><em>_maintype</em> is the <em class="mailheader">Content-Type</em> major type (e.g. <em class="mimetype">text</em>
or <em class="mimetype">image</em>), and <em>_subtype</em> is the <em class="mailheader">Content-Type</em> minor
type (e.g. <em class="mimetype">plain</em> or <em class="mimetype">gif</em>). <em>_params</em> is a parameter
key/value dictionary and is passed directly to <a class="reference internal" href="email.compat32-message.html#email.message.Message.add_header" title="email.message.Message.add_header"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Message.add_header</span></code></a>.</p>
<p>If <em>policy</em> is specified, (defaults to the
<a class="reference internal" href="email.policy.html#email.policy.Compat32" title="email.policy.Compat32"><code class="xref py py-class docutils literal notranslate"><span class="pre">compat32</span></code></a> policy) it will be passed to
<a class="reference internal" href="email.compat32-message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a>.</p>
<p>The <a class="reference internal" href="#email.mime.base.MIMEBase" title="email.mime.base.MIMEBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEBase</span></code></a> class always adds a <em class="mailheader">Content-Type</em> header
(based on <em>_maintype</em>, <em>_subtype</em>, and <em>_params</em>), and a
<em class="mailheader">MIME-Version</em> header (always set to <code class="docutils literal notranslate"><span class="pre">1.0</span></code>).</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.6: </span>Added <em>policy</em> keyword-only parameter.</p>
</div>
</dd></dl>
<dl class="class">
<dt id="email.mime.nonmultipart.MIMENonMultipart">
<em class="property">class </em><code class="descclassname">email.mime.nonmultipart.</code><code class="descname">MIMENonMultipart</code><a class="headerlink" href="#email.mime.nonmultipart.MIMENonMultipart" title="Permalink to this definition">¶</a></dt>
<dd><p>Module: <code class="xref py py-mod docutils literal notranslate"><span class="pre">email.mime.nonmultipart</span></code></p>
<p>A subclass of <a class="reference internal" href="#email.mime.base.MIMEBase" title="email.mime.base.MIMEBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEBase</span></code></a>, this is an intermediate base
class for MIME messages that are not <em class="mimetype">multipart</em>. The primary
purpose of this class is to prevent the use of the
<a class="reference internal" href="email.compat32-message.html#email.message.Message.attach" title="email.message.Message.attach"><code class="xref py py-meth docutils literal notranslate"><span class="pre">attach()</span></code></a> method, which only makes sense for
<em class="mimetype">multipart</em> messages. If <a class="reference internal" href="email.compat32-message.html#email.message.Message.attach" title="email.message.Message.attach"><code class="xref py py-meth docutils literal notranslate"><span class="pre">attach()</span></code></a>
is called, a <a class="reference internal" href="email.errors.html#email.errors.MultipartConversionError" title="email.errors.MultipartConversionError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MultipartConversionError</span></code></a> exception is raised.</p>
</dd></dl>
<dl class="class">
<dt id="email.mime.multipart.MIMEMultipart">
<em class="property">class </em><code class="descclassname">email.mime.multipart.</code><code class="descname">MIMEMultipart</code><span class="sig-paren">(</span><em>_subtype='mixed'</em>, <em>boundary=None</em>, <em>_subparts=None</em>, <em>*</em>, <em>policy=compat32</em>, <em>**_params</em><span class="sig-paren">)</span><a class="headerlink" href="#email.mime.multipart.MIMEMultipart" title="Permalink to this definition">¶</a></dt>
<dd><p>Module: <code class="xref py py-mod docutils literal notranslate"><span class="pre">email.mime.multipart</span></code></p>
<p>A subclass of <a class="reference internal" href="#email.mime.base.MIMEBase" title="email.mime.base.MIMEBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEBase</span></code></a>, this is an intermediate base
class for MIME messages that are <em class="mimetype">multipart</em>. Optional <em>_subtype</em>
defaults to <em class="mimetype">mixed</em>, but can be used to specify the subtype of the
message. A <em class="mailheader">Content-Type</em> header of <em class="mimetype">multipart/_subtype</em>
will be added to the message object. A <em class="mailheader">MIME-Version</em> header will
also be added.</p>
<p>Optional <em>boundary</em> is the multipart boundary string. When <code class="docutils literal notranslate"><span class="pre">None</span></code> (the
default), the boundary is calculated when needed (for example, when the
message is serialized).</p>
<p><em>_subparts</em> is a sequence of initial subparts for the payload. It must be
possible to convert this sequence to a list. You can always attach new subparts
to the message by using the <a class="reference internal" href="email.compat32-message.html#email.message.Message.attach" title="email.message.Message.attach"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Message.attach</span></code></a> method.</p>
<p>Optional <em>policy</em> argument defaults to <a class="reference internal" href="email.policy.html#email.policy.Compat32" title="email.policy.Compat32"><code class="xref py py-class docutils literal notranslate"><span class="pre">compat32</span></code></a>.</p>
<p>Additional parameters for the <em class="mailheader">Content-Type</em> header are taken from
the keyword arguments, or passed into the <em>_params</em> argument, which is a keyword
dictionary.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.6: </span>Added <em>policy</em> keyword-only parameter.</p>
</div>
</dd></dl>
<dl class="class">
<dt id="email.mime.application.MIMEApplication">
<em class="property">class </em><code class="descclassname">email.mime.application.</code><code class="descname">MIMEApplication</code><span class="sig-paren">(</span><em>_data</em>, <em>_subtype='octet-stream'</em>, <em>_encoder=email.encoders.encode_base64</em>, <em>*</em>, <em>policy=compat32</em>, <em>**_params</em><span class="sig-paren">)</span><a class="headerlink" href="#email.mime.application.MIMEApplication" title="Permalink to this definition">¶</a></dt>
<dd><p>Module: <code class="xref py py-mod docutils literal notranslate"><span class="pre">email.mime.application</span></code></p>
<p>A subclass of <a class="reference internal" href="#email.mime.nonmultipart.MIMENonMultipart" title="email.mime.nonmultipart.MIMENonMultipart"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMENonMultipart</span></code></a>, the
<a class="reference internal" href="#email.mime.application.MIMEApplication" title="email.mime.application.MIMEApplication"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEApplication</span></code></a> class is used to represent MIME message objects of
major type <em class="mimetype">application</em>. <em>_data</em> is a string containing the raw
byte data. Optional <em>_subtype</em> specifies the MIME subtype and defaults to
<em class="mimetype">octet-stream</em>.</p>
<p>Optional <em>_encoder</em> is a callable (i.e. function) which will perform the actual
encoding of the data for transport. This callable takes one argument, which is
the <a class="reference internal" href="#email.mime.application.MIMEApplication" title="email.mime.application.MIMEApplication"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEApplication</span></code></a> instance. It should use
<a class="reference internal" href="email.compat32-message.html#email.message.Message.get_payload" title="email.message.Message.get_payload"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_payload()</span></code></a> and
<a class="reference internal" href="email.compat32-message.html#email.message.Message.set_payload" title="email.message.Message.set_payload"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_payload()</span></code></a> to change the payload to encoded
form. It should also add
any <em class="mailheader">Content-Transfer-Encoding</em> or other headers to the message
object as necessary. The default encoding is base64. See the
<a class="reference internal" href="email.encoders.html#module-email.encoders" title="email.encoders: Encoders for email message payloads."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.encoders</span></code></a> module for a list of the built-in encoders.</p>
<p>Optional <em>policy</em> argument defaults to <a class="reference internal" href="email.policy.html#email.policy.Compat32" title="email.policy.Compat32"><code class="xref py py-class docutils literal notranslate"><span class="pre">compat32</span></code></a>.</p>
<p><em>_params</em> are passed straight through to the base class constructor.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.6: </span>Added <em>policy</em> keyword-only parameter.</p>
</div>
</dd></dl>
<dl class="class">
<dt id="email.mime.audio.MIMEAudio">
<em class="property">class </em><code class="descclassname">email.mime.audio.</code><code class="descname">MIMEAudio</code><span class="sig-paren">(</span><em>_audiodata</em>, <em>_subtype=None</em>, <em>_encoder=email.encoders.encode_base64</em>, <em>*</em>, <em>policy=compat32</em>, <em>**_params</em><span class="sig-paren">)</span><a class="headerlink" href="#email.mime.audio.MIMEAudio" title="Permalink to this definition">¶</a></dt>
<dd><p>Module: <code class="xref py py-mod docutils literal notranslate"><span class="pre">email.mime.audio</span></code></p>
<p>A subclass of <a class="reference internal" href="#email.mime.nonmultipart.MIMENonMultipart" title="email.mime.nonmultipart.MIMENonMultipart"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMENonMultipart</span></code></a>, the
<a class="reference internal" href="#email.mime.audio.MIMEAudio" title="email.mime.audio.MIMEAudio"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEAudio</span></code></a> class is used to create MIME message objects of major type
<em class="mimetype">audio</em>. <em>_audiodata</em> is a string containing the raw audio data. If
this data can be decoded by the standard Python module <a class="reference internal" href="sndhdr.html#module-sndhdr" title="sndhdr: Determine type of a sound file."><code class="xref py py-mod docutils literal notranslate"><span class="pre">sndhdr</span></code></a>, then the
subtype will be automatically included in the <em class="mailheader">Content-Type</em> header.
Otherwise you can explicitly specify the audio subtype via the <em>_subtype</em>
argument. If the minor type could not be guessed and <em>_subtype</em> was not given,
then <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> is raised.</p>
<p>Optional <em>_encoder</em> is a callable (i.e. function) which will perform the actual
encoding of the audio data for transport. This callable takes one argument,
which is the <a class="reference internal" href="#email.mime.audio.MIMEAudio" title="email.mime.audio.MIMEAudio"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEAudio</span></code></a> instance. It should use
<a class="reference internal" href="email.compat32-message.html#email.message.Message.get_payload" title="email.message.Message.get_payload"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_payload()</span></code></a> and
<a class="reference internal" href="email.compat32-message.html#email.message.Message.set_payload" title="email.message.Message.set_payload"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_payload()</span></code></a> to change the payload to encoded
form. It should also add
any <em class="mailheader">Content-Transfer-Encoding</em> or other headers to the message
object as necessary. The default encoding is base64. See the
<a class="reference internal" href="email.encoders.html#module-email.encoders" title="email.encoders: Encoders for email message payloads."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.encoders</span></code></a> module for a list of the built-in encoders.</p>
<p>Optional <em>policy</em> argument defaults to <a class="reference internal" href="email.policy.html#email.policy.Compat32" title="email.policy.Compat32"><code class="xref py py-class docutils literal notranslate"><span class="pre">compat32</span></code></a>.</p>
<p><em>_params</em> are passed straight through to the base class constructor.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.6: </span>Added <em>policy</em> keyword-only parameter.</p>
</div>
</dd></dl>
<dl class="class">
<dt id="email.mime.image.MIMEImage">
<em class="property">class </em><code class="descclassname">email.mime.image.</code><code class="descname">MIMEImage</code><span class="sig-paren">(</span><em>_imagedata</em>, <em>_subtype=None</em>, <em>_encoder=email.encoders.encode_base64</em>, <em>*</em>, <em>policy=compat32</em>, <em>**_params</em><span class="sig-paren">)</span><a class="headerlink" href="#email.mime.image.MIMEImage" title="Permalink to this definition">¶</a></dt>
<dd><p>Module: <code class="xref py py-mod docutils literal notranslate"><span class="pre">email.mime.image</span></code></p>
<p>A subclass of <a class="reference internal" href="#email.mime.nonmultipart.MIMENonMultipart" title="email.mime.nonmultipart.MIMENonMultipart"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMENonMultipart</span></code></a>, the
<a class="reference internal" href="#email.mime.image.MIMEImage" title="email.mime.image.MIMEImage"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEImage</span></code></a> class is used to create MIME message objects of major type
<em class="mimetype">image</em>. <em>_imagedata</em> is a string containing the raw image data. If
this data can be decoded by the standard Python module <a class="reference internal" href="imghdr.html#module-imghdr" title="imghdr: Determine the type of image contained in a file or byte stream."><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code></a>, then the
subtype will be automatically included in the <em class="mailheader">Content-Type</em> header.
Otherwise you can explicitly specify the image subtype via the <em>_subtype</em>
argument. If the minor type could not be guessed and <em>_subtype</em> was not given,
then <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> is raised.</p>
<p>Optional <em>_encoder</em> is a callable (i.e. function) which will perform the actual
encoding of the image data for transport. This callable takes one argument,
which is the <a class="reference internal" href="#email.mime.image.MIMEImage" title="email.mime.image.MIMEImage"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEImage</span></code></a> instance. It should use
<a class="reference internal" href="email.compat32-message.html#email.message.Message.get_payload" title="email.message.Message.get_payload"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_payload()</span></code></a> and
<a class="reference internal" href="email.compat32-message.html#email.message.Message.set_payload" title="email.message.Message.set_payload"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_payload()</span></code></a> to change the payload to encoded
form. It should also add
any <em class="mailheader">Content-Transfer-Encoding</em> or other headers to the message
object as necessary. The default encoding is base64. See the
<a class="reference internal" href="email.encoders.html#module-email.encoders" title="email.encoders: Encoders for email message payloads."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.encoders</span></code></a> module for a list of the built-in encoders.</p>
<p>Optional <em>policy</em> argument defaults to <a class="reference internal" href="email.policy.html#email.policy.Compat32" title="email.policy.Compat32"><code class="xref py py-class docutils literal notranslate"><span class="pre">compat32</span></code></a>.</p>
<p><em>_params</em> are passed straight through to the <a class="reference internal" href="#email.mime.base.MIMEBase" title="email.mime.base.MIMEBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEBase</span></code></a>
constructor.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.6: </span>Added <em>policy</em> keyword-only parameter.</p>
</div>
</dd></dl>
<dl class="class">
<dt id="email.mime.message.MIMEMessage">
<em class="property">class </em><code class="descclassname">email.mime.message.</code><code class="descname">MIMEMessage</code><span class="sig-paren">(</span><em>_msg</em>, <em>_subtype='rfc822'</em>, <em>*</em>, <em>policy=compat32</em><span class="sig-paren">)</span><a class="headerlink" href="#email.mime.message.MIMEMessage" title="Permalink to this definition">¶</a></dt>
<dd><p>Module: <code class="xref py py-mod docutils literal notranslate"><span class="pre">email.mime.message</span></code></p>
<p>A subclass of <a class="reference internal" href="#email.mime.nonmultipart.MIMENonMultipart" title="email.mime.nonmultipart.MIMENonMultipart"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMENonMultipart</span></code></a>, the
<a class="reference internal" href="#email.mime.message.MIMEMessage" title="email.mime.message.MIMEMessage"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEMessage</span></code></a> class is used to create MIME objects of main type
<em class="mimetype">message</em>. <em>_msg</em> is used as the payload, and must be an instance
of class <a class="reference internal" href="email.compat32-message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> (or a subclass thereof), otherwise
a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> is raised.</p>
<p>Optional <em>_subtype</em> sets the subtype of the message; it defaults to
<em class="mimetype">rfc822</em>.</p>
<p>Optional <em>policy</em> argument defaults to <a class="reference internal" href="email.policy.html#email.policy.Compat32" title="email.policy.Compat32"><code class="xref py py-class docutils literal notranslate"><span class="pre">compat32</span></code></a>.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.6: </span>Added <em>policy</em> keyword-only parameter.</p>
</div>
</dd></dl>
<dl class="class">
<dt id="email.mime.text.MIMEText">
<em class="property">class </em><code class="descclassname">email.mime.text.</code><code class="descname">MIMEText</code><span class="sig-paren">(</span><em>_text</em>, <em>_subtype='plain'</em>, <em>_charset=None</em>, <em>*</em>, <em>policy=compat32</em><span class="sig-paren">)</span><a class="headerlink" href="#email.mime.text.MIMEText" title="Permalink to this definition">¶</a></dt>
<dd><p>Module: <code class="xref py py-mod docutils literal notranslate"><span class="pre">email.mime.text</span></code></p>
<p>A subclass of <a class="reference internal" href="#email.mime.nonmultipart.MIMENonMultipart" title="email.mime.nonmultipart.MIMENonMultipart"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMENonMultipart</span></code></a>, the
<a class="reference internal" href="#email.mime.text.MIMEText" title="email.mime.text.MIMEText"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEText</span></code></a> class is used to create MIME objects of major type
<em class="mimetype">text</em>. <em>_text</em> is the string for the payload. <em>_subtype</em> is the
minor type and defaults to <em class="mimetype">plain</em>. <em>_charset</em> is the character
set of the text and is passed as an argument to the
<a class="reference internal" href="#email.mime.nonmultipart.MIMENonMultipart" title="email.mime.nonmultipart.MIMENonMultipart"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMENonMultipart</span></code></a> constructor; it defaults
to <code class="docutils literal notranslate"><span class="pre">us-ascii</span></code> if the string contains only <code class="docutils literal notranslate"><span class="pre">ascii</span></code> code points, and
<code class="docutils literal notranslate"><span class="pre">utf-8</span></code> otherwise. The <em>_charset</em> parameter accepts either a string or a
<a class="reference internal" href="email.charset.html#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instance.</p>
<p>Unless the <em>_charset</em> argument is explicitly set to <code class="docutils literal notranslate"><span class="pre">None</span></code>, the
MIMEText object created will have both a <em class="mailheader">Content-Type</em> header
with a <code class="docutils literal notranslate"><span class="pre">charset</span></code> parameter, and a <em class="mailheader">Content-Transfer-Encoding</em>
header. This means that a subsequent <code class="docutils literal notranslate"><span class="pre">set_payload</span></code> call will not result
in an encoded payload, even if a charset is passed in the <code class="docutils literal notranslate"><span class="pre">set_payload</span></code>
command. You can “reset” this behavior by deleting the
<code class="docutils literal notranslate"><span class="pre">Content-Transfer-Encoding</span></code> header, after which a <code class="docutils literal notranslate"><span class="pre">set_payload</span></code> call
will automatically encode the new payload (and add a new
<em class="mailheader">Content-Transfer-Encoding</em> header).</p>
<p>Optional <em>policy</em> argument defaults to <a class="reference internal" href="email.policy.html#email.policy.Compat32" title="email.policy.Compat32"><code class="xref py py-class docutils literal notranslate"><span class="pre">compat32</span></code></a>.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.5: </span><em>_charset</em> also accepts <a class="reference internal" href="email.charset.html#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instances.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.6: </span>Added <em>policy</em> keyword-only parameter.</p>
</div>
</dd></dl>
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