Instead of making a mess of updates & edits, I am adding a new post.
The error:
Code:
Couldn't append msg #1019 (Subject:[sanitized subject line]) to folder INBOX: 1221 NO APPEND failed
Occurred on two e-mail messages. Both e-mails contain 3 PDF attachments of 14MB average each. The problem is not attachment size as I already updated zimbraFileUploadMaxSize to resolve an earlier problem I was having. Also there were some messages which synced fine with attachments + overhead totaling closer to 80MB.
Let me know if I can provide anything more of use.
Cheers,
RioGD