I have updated my Zimbra and OS info in my profile .The biggest proble with me is I dont see anything wrong in my logs.
Actual problem is I have two mail server old mail server is QMAIL and new mail server is ZImbra.Both the servers are same in terms of Domain hosting both mail servers have two domain hosted abc.com and xyz.com the oly difference is in the MX record.I am using BIND DNS on my Zimbra Server.Its random if a mail is coming from foo.com to my domain for user
aamralkar@xyz.com zimbra its not accepting and mails goes to my Qmail server and it acepts mail for the user .