Corrupted attachments in Thunderbird forward filter

Question

I created a filter in Thunderbird 14 on client A that, when a certain rule on incoming mail is satisfied, the same mail is forwarded to client B and C.

Matching mails received from A are always forwarded to B and C, and that's what I want. Though, when the mail on A has an attachment, it is also forwarded by B and C but the file they receive is corrupted. In my case the incoming file on A is a Word file of about 10kb in size; clients B and C receive a Word file of 27 bytes.

I think this could happen because the forward starts from A when the attachment is not yet completely downloaded. I'm not sure this is the cause, though. And I wouldn't have any idea for a fix.

Any idea about how to investigate or solve the issue?

Answer 1

This is a bug in Thunderbird. It seems to be an old issue that some users have seen on several versions of Thundbird over the last few years. The bug reports seem quite long and confused, so it's likely a hard to reproduce bug.

You should upgrade to the newest version of Thunderbird (currently 16) if possible.

If this doesn't solve the problem you should review the following bugs and perhaps try to add any additional information (like the mail server you are using) to help the free, open source project fix the issue:

https://bugzilla.mozilla.org/show_bug.cgi?id=570914

https://bugzilla.mozilla.org/show_bug.cgi?id=548507