Hi Ahmad,
I don't know why do you need this ...but your problem is the very same hostname used by each postfix istances, so you can try to change the postfix helo value on one of istances (smtp_helo_name).
Code:
zmlocalconfig -e postfix_smtp_helo_name=mailnew.example.com
Depending of your zimbra version, if you have, this property should be supported without any other changes.
Check zmconfigd.cf/zmmta.cf file if you find a line like:
Code:
POSTCONF smtp_helo_name LOCAL postfix_smtp_helo_name
Please pay attention that this change can have some implication on your external mail delivery, like DNS and reverse-DNS checks made by all recipient mailservers.
Have a nice day.
D0s0n
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