Well, there's also the possibility as we discussed in October that your mta is passing (too) long (to be compliant) lines to cyrus, and the logic doesn't distinguish and prints the same error.
FYI, WebCT (Campus Edition) also triggers this problem.
If an instructor has their WebCT mail forwarded to their Cyrus account, and a student posts a message containing a huge attachment within WebCT for that instructor, upon delivery to Cyrus that message will blow up as you describe. I found out that WebCT encoded such attachments as one long line and not nicely folded text like most clients do. I reported the problem to them and they said it would be addressed in some future release, but don't know when.
Amos
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