Hello support

I have hosting, i install my own dedicated mail server.
I config 2 domains on Zimbra, and its great (network edition).

Both domains (A,B) sent email to my local IP (domain A and B). DNS are config on Hosting provider.


Domain A receive and sent ok no problem.

Domain B has this when i try to receive email (from gmail).

on Domain B i delete accounts from postini (located on hosting provider, not on my server Zimbra). But i dont have idea why i see this 550-(psmtp.com) [64.18.2.125]:59174 is currently not permitted to relay through . Because is from postini.

can u help me?




Code:
Delivery to the following recipient failed permanently:

     user@domain.com

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain domain.com by domainl.com.s7a1.psmtp.com. [x.x.x.x].

The error that the other server returned was:
550-(psmtp.com) [64.18.2.125]:59174 is currently not permitted to relay through
550 this server.