I'm having an irregular issue with Zimbra and file attachments.

I'm running v3.1 on RHEL 4 (Twin 3Ghz Processors w/1Gb RAM)

Occassionally, when attachments are sent, they are being corrupted. I'm convinced it's being done by my Zimbra server as I've been able to replicate it with a specific message I have with attachments. I have been able to successfully receive this same message at my work email and at a gmail account without problems with the attachments.

The errors in my /var/log/zimbra.log file are:

Apr 21 10:49:45 email amavis[25617]: (25617-01) WARN: MIME::Parser error: part did not end with expected boundary
Apr 21 10:49:46 email amavis[25617]: (25617-01) spam_scan: not wasting time on SA, message longer than 65536 bytes: 1566+79606
Apr 21 10:49:46 email amavis[25617]: (25617-01) BAD HEADER from <username@organization.com>: MIME error: error: part did not end with expected boundary

This behavior is seen regardless of whether I'm using the web frontend to Zimbra or using Thunderbird to connect via IMAP.

Any ideas?

Thanks!