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POParsing Email Body with 7BIT Content-Transfer-Encoding - PHP
 

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    <p>I've been implementing some PHP/IMAP-based email handling functionality lately, and have most everything working great, except for message body decoding (in some circumstances).</p> <p>I think that, by now, I've half-memorized <a href="http://www.faqs.org/rfcs/rfc2822.html">RFC 2822</a> (the 'Internet Message Format' document guidelines), read through email-handling code for half a dozen open source CMSes, and read a bajillion forum posts, blog posts, etc. dealing with handling email in PHP.</p> <p>I've also forked and completely rewritten a class for PHP, <a href="https://github.com/geerlingguy/Imap">Imap</a>, and the class handles email respectably well—I have some helpful methods in there to detect autoresponders (for out of office, old addresses, etc.), decode base64 and 8bit messages, etc.</p> <p><strong>However, the one thing I simply can't get to work reliably (or, sometimes, at all) is when a message comes in with <code>Content-Transfer-Encoding: 7bit</code>.</strong></p> <p>It seems that different email clients/services interpret <code>7BIT</code> to mean different things. I've gotten some emails that are supposedly <code>7BIT</code> that are <em>actually</em> Base64-encoded. I've gotten some that are <em>actually</em> quoted-printable-encoded. And some that are not encoded in any way whatsoever. And some that are HTML, but aren't indicated as being HTML, and they're also listed as <code>7BIT</code>...</p> <p>Here are a few examples (snips) of message bodies received with 7Bit encodings:</p> <p>1:</p> <pre><code>A random message=20 Sent from my iPhone </code></pre> <p>2:</p> <pre><code>PGh0bWwgeG1sbnM6dj0idXJuOnNjaGVtYXMtbWljcm9zb2Z0LWNvbTp2bWwi IHhtbG5zOm89InVybjpzY2hlbWFzLW1pY3Jvc29mdC1jb206b2ZmaWNlOm9m </code></pre> <p>3:</p> <pre><code>tangerine apricot pepper.=0A=C2=A0=0ALet me know if you have any availabili= ty over the next month or so. =0A=C2=A0=0AThank you,=0ANames Withheld=0A908= -319-5916=0A=C2=A0=0A=C2=A0=0A=C2=A0=0A=0A=0A______________________________= __=0AFrom: Names Witheld =0ATo: Names Withheld= </code></pre> <p>These are <strong>all</strong> sent with '7Bit' encodings (well, at least according to PHP/<code>imap_*</code>), but they're obviously in need of more decoding before I can pass them along as plaintext. Is there any way to reliably convert all messages with supposedly-7Bit encodings to plaintext?</p>
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    1. COIf everyone just sent plaintext email, and used a nice, simple client like Mail for iOS, or `mail` on the command line, the world would be a better place :)
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    2. COThose are broken messages. 7-bit means plain ascii: all characters in the message should be plain US-ASCII, with no additional encoding. Something there is lying to you. You can certainly try to do heuristic detection.
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    3. COAlso, you should pull the original MIME message down with a client like Thunderbird or something and look at it to make sure something in PHP isn't lying to you.
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