I have been using ZCS 5.0 for quite sometime and things were working well until I decided to upgrade ZCS 6.0 .
I did a clean install of ZCS 6.0. My config scenario is as follows
server : mail.abc.in ( where abc is my public domain )
I have created another domain within zimbra i.e abc.in
I create users in mail.abc.in domain and create an alias (eg firstname.lastname@example.org)
The reason for doing so is my users login using employee number eg email@example.com while their mails are sent and received in their respective alias (for eg firstname.lastname@example.org)
My MX records are working fine and DNS is internally hosted. Nslookup and dig for abc.in and mail.abc.in reply with the correct MX records.
Now the problem :
When I send mails from external network (eg gmail.com) to address email@example.com. The mail is delivered to the correct mailbox but the sender still gets a bounced message like this
The mail system
Final-Recipient: rfc822; firstname.lastname@example.org
Diagnostic-Code: X-Postfix; abc.in
And this is what i get in the zimbra.log file
Jun 10 15:32:11 mail postfix/error: DBBD72185EA: to=
, relay=none, delay=0.02, delays=0.01/0.01/0/0, dsn=5.0.0, status=bounced (abc.in)
I have already read about split DNS and other workarounds as mentioned in the zimbra wiki for incoming issues but the problem persists.
Plzzzzzz Help !!!!!!!!!