We have Exchange-based mail gate and Zimbra after that. Exchange receives mail from outer world and after AD checking relays all necessary mail to Zimbra.
For example.
client@outer.world -- >
user@office.domain
All works fine, mail is delivered without errors.
The problem is:
When
client@outer.world send mail with specific attach (unzipped MSOffice document) he receive NDR from Exchange and
user@office.domain don't receive this letter in his inbox.
zmmsgtrace shows nothing about this letter.
user@office.domain Inbox is working fine with no problems. Mail without attaches delivers fine.
Can't find errors in Exchange log files.
Any ideas?
Bugzilla
Wiki
Source
Some strange problem with attached files. 
Linear Mode
