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<section id="module-email.errors">
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<span id="email-errors-exception-and-defect-classes"></span><h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.errors</span></code>: Exception and Defect classes<a class="headerlink" href="#module-email.errors" title="Link to this heading">¶</a></h1>
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<p><strong>Source code:</strong> <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/3.13/Lib/email/errors.py">Lib/email/errors.py</a></p>
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<p>The following exception classes are defined in the <a class="reference internal" href="#module-email.errors" title="email.errors: The exception classes used by the email package."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.errors</span></code></a> module:</p>
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<dl class="py exception">
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<dt class="sig sig-object py" id="email.errors.MessageError">
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<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MessageError</span></span><a class="headerlink" href="#email.errors.MessageError" title="Link to this definition">¶</a></dt>
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<dd><p>This is the base class for all exceptions that 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 can
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raise. It is derived from the standard <a class="reference internal" href="exceptions.html#Exception" title="Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a> class and defines no
|
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additional methods.</p>
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</dd></dl>
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<dl class="py exception">
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||
<dt class="sig sig-object py" id="email.errors.MessageParseError">
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||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MessageParseError</span></span><a class="headerlink" href="#email.errors.MessageParseError" title="Link to this definition">¶</a></dt>
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||
<dd><p>This is the base class for exceptions raised by the
|
||
<a class="reference internal" href="email.parser.html#email.parser.Parser" title="email.parser.Parser"><code class="xref py py-class docutils literal notranslate"><span class="pre">Parser</span></code></a> class. It is derived from
|
||
<a class="reference internal" href="#email.errors.MessageError" title="email.errors.MessageError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MessageError</span></code></a>. This class is also used internally by the parser used
|
||
by <a class="reference internal" href="email.headerregistry.html#module-email.headerregistry" title="email.headerregistry: Automatic Parsing of headers based on the field name"><code class="xref py py-mod docutils literal notranslate"><span class="pre">headerregistry</span></code></a>.</p>
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</dd></dl>
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<dl class="py exception">
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||
<dt class="sig sig-object py" id="email.errors.HeaderParseError">
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<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">HeaderParseError</span></span><a class="headerlink" href="#email.errors.HeaderParseError" title="Link to this definition">¶</a></dt>
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||
<dd><p>Raised under some error conditions when parsing the <span class="target" id="index-0"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc5322.html"><strong>RFC 5322</strong></a> headers of a
|
||
message, this class is derived from <a class="reference internal" href="#email.errors.MessageParseError" title="email.errors.MessageParseError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MessageParseError</span></code></a>. The
|
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<a class="reference internal" href="email.message.html#email.message.EmailMessage.set_boundary" title="email.message.EmailMessage.set_boundary"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_boundary()</span></code></a> method will raise this
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error if the content type is unknown when the method is called.
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<a class="reference internal" href="email.header.html#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate"><span class="pre">Header</span></code></a> may raise this error for certain base64
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decoding errors, and when an attempt is made to create a header that appears
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to contain an embedded header (that is, there is what is supposed to be a
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||
continuation line that has no leading whitespace and looks like a header).</p>
|
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</dd></dl>
|
||
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<dl class="py exception">
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||
<dt class="sig sig-object py" id="email.errors.BoundaryError">
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<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">BoundaryError</span></span><a class="headerlink" href="#email.errors.BoundaryError" title="Link to this definition">¶</a></dt>
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<dd><p>Deprecated and no longer used.</p>
|
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</dd></dl>
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|
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<dl class="py exception">
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<dt class="sig sig-object py" id="email.errors.MultipartConversionError">
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<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MultipartConversionError</span></span><a class="headerlink" href="#email.errors.MultipartConversionError" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Raised if 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 is called
|
||
on an instance of a class derived from
|
||
<a class="reference internal" href="email.mime.html#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> (e.g.
|
||
<a class="reference internal" href="email.mime.html#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>).
|
||
<a class="reference internal" href="#email.errors.MultipartConversionError" title="email.errors.MultipartConversionError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MultipartConversionError</span></code></a> multiply
|
||
inherits from <a class="reference internal" href="#email.errors.MessageError" title="email.errors.MessageError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MessageError</span></code></a> and the built-in <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>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.HeaderWriteError">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">HeaderWriteError</span></span><a class="headerlink" href="#email.errors.HeaderWriteError" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Raised when an error occurs when the <a class="reference internal" href="email.generator.html#module-email.generator" title="email.generator: Generate flat text email messages from a message structure."><code class="xref py py-mod docutils literal notranslate"><span class="pre">generator</span></code></a> outputs
|
||
headers.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.MessageDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MessageDefect</span></span><a class="headerlink" href="#email.errors.MessageDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>This is the base class for all defects found when parsing email messages.
|
||
It is derived from <a class="reference internal" href="exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.HeaderDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">HeaderDefect</span></span><a class="headerlink" href="#email.errors.HeaderDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>This is the base class for all defects found when parsing email headers.
|
||
It is derived from <a class="reference internal" href="#email.errors.MessageDefect" title="email.errors.MessageDefect"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MessageDefect</span></code></a>.</p>
|
||
</dd></dl>
|
||
|
||
<p>Here is the list of the defects that the <a class="reference internal" href="email.parser.html#email.parser.FeedParser" title="email.parser.FeedParser"><code class="xref py py-class docutils literal notranslate"><span class="pre">FeedParser</span></code></a>
|
||
can find while parsing messages. Note that the defects are added to the message
|
||
where the problem was found, so for example, if a message nested inside a
|
||
<em class="mimetype">multipart/alternative</em> had a malformed header, that nested message
|
||
object would have a defect, but the containing messages would not.</p>
|
||
<p>All defect classes are subclassed from <a class="reference internal" href="#email.errors.MessageDefect" title="email.errors.MessageDefect"><code class="xref py py-class docutils literal notranslate"><span class="pre">email.errors.MessageDefect</span></code></a>.</p>
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.NoBoundaryInMultipartDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">NoBoundaryInMultipartDefect</span></span><a class="headerlink" href="#email.errors.NoBoundaryInMultipartDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>A message claimed to be a multipart, but had no <em class="mimetype">boundary</em>
|
||
parameter.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.StartBoundaryNotFoundDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">StartBoundaryNotFoundDefect</span></span><a class="headerlink" href="#email.errors.StartBoundaryNotFoundDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>The start boundary claimed in the <em class="mailheader">Content-Type</em> header was
|
||
never found.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.CloseBoundaryNotFoundDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">CloseBoundaryNotFoundDefect</span></span><a class="headerlink" href="#email.errors.CloseBoundaryNotFoundDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>A start boundary was found, but no corresponding close boundary was ever
|
||
found.</p>
|
||
<div class="versionadded">
|
||
<p><span class="versionmodified added">Added in version 3.3.</span></p>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.FirstHeaderLineIsContinuationDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">FirstHeaderLineIsContinuationDefect</span></span><a class="headerlink" href="#email.errors.FirstHeaderLineIsContinuationDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>The message had a continuation line as its first header line.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.MisplacedEnvelopeHeaderDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MisplacedEnvelopeHeaderDefect</span></span><a class="headerlink" href="#email.errors.MisplacedEnvelopeHeaderDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>A “Unix From” header was found in the middle of a header block.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.MissingHeaderBodySeparatorDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MissingHeaderBodySeparatorDefect</span></span><a class="headerlink" href="#email.errors.MissingHeaderBodySeparatorDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>A line was found while parsing headers that had no leading white space but
|
||
contained no ‘:’. Parsing continues assuming that the line represents the
|
||
first line of the body.</p>
|
||
<div class="versionadded">
|
||
<p><span class="versionmodified added">Added in version 3.3.</span></p>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.MalformedHeaderDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MalformedHeaderDefect</span></span><a class="headerlink" href="#email.errors.MalformedHeaderDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>A header was found that was missing a colon, or was otherwise malformed.</p>
|
||
<div class="deprecated">
|
||
<p><span class="versionmodified deprecated">Deprecated since version 3.3: </span>This defect has not been used for several Python versions.</p>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.MultipartInvariantViolationDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MultipartInvariantViolationDefect</span></span><a class="headerlink" href="#email.errors.MultipartInvariantViolationDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>A message claimed to be a <em class="mimetype">multipart</em>, but no subparts were found.
|
||
Note that when a message has this defect, its
|
||
<a class="reference internal" href="email.compat32-message.html#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_multipart()</span></code></a> method may return <code class="docutils literal notranslate"><span class="pre">False</span></code>
|
||
even though its content type claims to be <em class="mimetype">multipart</em>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.InvalidBase64PaddingDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">InvalidBase64PaddingDefect</span></span><a class="headerlink" href="#email.errors.InvalidBase64PaddingDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>When decoding a block of base64 encoded bytes, the padding was not correct.
|
||
Enough padding is added to perform the decode, but the resulting decoded
|
||
bytes may be invalid.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.InvalidBase64CharactersDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">InvalidBase64CharactersDefect</span></span><a class="headerlink" href="#email.errors.InvalidBase64CharactersDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>When decoding a block of base64 encoded bytes, characters outside the base64
|
||
alphabet were encountered. The characters are ignored, but the resulting
|
||
decoded bytes may be invalid.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.InvalidBase64LengthDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">InvalidBase64LengthDefect</span></span><a class="headerlink" href="#email.errors.InvalidBase64LengthDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>When decoding a block of base64 encoded bytes, the number of non-padding
|
||
base64 characters was invalid (1 more than a multiple of 4). The encoded
|
||
block was kept as-is.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py exception">
|
||
<dt class="sig sig-object py" id="email.errors.InvalidDateDefect">
|
||
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">InvalidDateDefect</span></span><a class="headerlink" href="#email.errors.InvalidDateDefect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>When decoding an invalid or unparsable date field. The original value is
|
||
kept as-is.</p>
|
||
</dd></dl>
|
||
|
||
</section>
|
||
|
||
|
||
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<h4>Previous topic</h4>
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<p class="topless"><a href="email.policy.html"
|
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title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.policy</span></code>: Policy Objects</a></p>
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|
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<h4>Next topic</h4>
|
||
<p class="topless"><a href="email.headerregistry.html"
|
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Last updated on Apr 08, 2025 (14:33 UTC).
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