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    <p>You can also achieve what you want using the <a href="http://docs.python.org/library/email.html" rel="nofollow noreferrer"><code>email</code> module</a>'s <a href="http://docs.python.org/library/email.parser.html#parser-class-api" rel="nofollow noreferrer"><code>HeaderParser.parsestr()</code> function</a> (<em>same API as Parser but doesn't worry about the email's body</em>) and the <a href="http://docs.python.org/library/email.util.html#email.utils.parseaddr" rel="nofollow noreferrer"><code>parseaddr()</code> function</a>.</p> <pre><code>&gt;&gt;&gt; from email.parser import HeaderParser &gt;&gt;&gt; from email.utils import parseaddr &gt;&gt;&gt; hp = HeaderParser() &gt;&gt;&gt; response = [('1 (BODY[HEADER.FIELDS (MESSAGE-ID)] {78}', 'Message-ID: &lt;actualmessageid@mail.mail.gmail.com&gt;\r\n\r\n'), ')'] &gt;&gt;&gt; header_string = response[0][1] &gt;&gt;&gt; header_string 'Message-ID: &lt;actualmessageid@mail.mail.gmail.com&gt;\r\n\r\n' &gt;&gt;&gt; header = hp.parsestr(header_string) &gt;&gt;&gt; header &lt;email.message.Message instance at 0x023A6198&gt; &gt;&gt;&gt; header['message-id'] '&lt;actualmessageid@mail.mail.gmail.com&gt;' &gt;&gt;&gt; msg_id = parseaddr(header['message-id']) &gt;&gt;&gt; msg_id ('', 'actualmessageid@mail.mail.gmail.com') &gt;&gt;&gt; msg_id[1] 'actualmessageid@mail.mail.gmail.com' </code></pre> <p><strong>Thus:</strong></p> <pre><code>from email.parser import HeaderParser from email.utils import parseaddr hp = HeaderParser() def get_id(response): header_string = response[0][1] header = hp.parsestr(header_string) return parseaddr(header['message-id'])[1] response = [('1 (BODY[HEADER.FIELDS (MESSAGE-ID)] {78}', 'Message-ID: &lt;actualmessageid@mail.mail.gmail.com&gt;\r\n\r\n'), ')'] print(get_id(response)) </code></pre> <p><strong>returns:</strong></p> <pre>actualmessageid@mail.mail.gmail.com</pre>
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