[SOLVED] How To Relay Multi Mail Server

[H.c.K]

Hi,
I have a lot of mail servers. I installed 2 pmg for these servers. They are now working as a cluster.
The situation briefly looks like this:
mail1.abc.com 1.1.1.1
mail2.abc.com 1.1.1.2
--
pmg1.abc.com 1.1.1.5 - master cluster
pmg2.abc.com 1.1.1.6 - node cluster

My settings:
Default Relay: 1.1.1.1 (mail1.abc.com)

Transports:
1.1.1.1
1.1.1.2

Networks:
1.1.1.0/24

The problem I'm having is not forwarded when I send mail to an address on my mail2.abc.com server. What should I do?
Error:
host 1.1.1.1[1.1.1.1] said: 503 This
mail server requires authentication when attempting to send to a non-local
e-mail address. Please check your mail client settings or contact your
administrator to verify that the domain or address is defined for this
server. (in reply to RCPT TO command)

++++++
Solved:
I'am adding Transports:

maildomain.com - mail2.abc.com

All domains on the mail server must be added here.