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<p>Hello.</p>
<p>This is a question about the imap protocol, since I am having a
hard time finding these things out, so I hope you guys can help
me. We are using Dovecot to receive mails and having an issue
with Thunderbird. <br>
Basically, we are running into this bug with a lot of people: <a
href="https://bugzilla.mozilla.org/show_bug.cgi?id=216308">https://bugzilla.mozilla.org/show_bug.cgi?id=216308.
<br>
</a></p>
<p>The gist of it is, that sometimes, when there is an image linked
with the <a class="moz-txt-link-freetext" href="imap://">imap://</a> protocol in the mail, then Thunderbird wants to
subscribe to the folder that contains this mail, but fails. <br>
If I pull the mail off the server, it also has that link in the
raw mail. However, most mails store the images as a base64 code
block. <br>
</p>
<p>I have actually seen mails getting changed over night, from
<a class="moz-txt-link-freetext" href="imap://">imap://</a> links to base64 code blocks, but I can't reproduce that.
All computers are supposed to have the same Thunderbird version
and they do. <br>
</p>
<p>My questions right now are: <br>
</p>
<p>* Speaking about the general imap/mail protocol, do mails store
images as base64 or <a class="moz-txt-link-freetext" href="imap://">imap://</a> links. What is the standard here?<br>
* Is there anything we can do to prevent Thunderbird from running
into this bug? We are using Dovecot 2.2.36.4<br>
* What can cause an email getting changed over night or getting
synced back with the base64 blocks? It was already read, when we
ran into the issue.</p>
<p>With best regards,</p>
<p>Domeniko Gentner<br>
</p>
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