Hi:

I configured split domain 2 servers, one is domino (xyx@abc.com)as primary one is zimbra secondary.
Now it run fine , but when mail send from gmail.com to zimbra say XXX@abc.com

it return relay error ...but email can really relayed from primary server ..any idea?

Your message WAS SUCCESSFULLY RELAYED to:
<xxx@abc.com>

The message WAS NOT relayed to:
<""@abc.com>: [127.0.0.1] said:
501 5.1.3 id=22716-01 - Rejected by MTA on relaying, from MTA([127.0.0.1]:10025): 501 5.1.3 Bad recipient address syntax

This delivery report was generated by the program amavisd-new at host
zimbra.abc.com. Our internal reference code for your message is
22716-01/erzueQfZ9mza

Return-Path: <my@gmail.com> (OK)
From: my@gmail.com (dkim:AUTHOR)
Message-ID:
<CAELz9dtep14YMmE2uCf9tk_=NL6Hei5hJX5qMOrMV2OF1qVc Sw@mail.gmail.com>
Subject: dd