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zimbra admin console 

Zimbra Collaboration
(network edition / open source)

> Admin Console
zimbra admin - configure - global settings - mta

Zimbra Administration

> Configure

> Global Settings

> MTA
zimbraadmin-mta-relaymtaforexternaldelivery

Authentication

Enable authentication   [ ]
TLS authenticaton only [ ]


Network

Web mail MTA Hostnames: localhost
Web mail MTA Port: 25

Relay MTA for external delivery: rsxxx.realsender.com : 25
Relay MTA for external delivery (fallback): rsxxx.realsender.com : 25

Please inform our support team that you're using Zimbra Collaboration,
so that we configure our servers to accept the connection without any further setup on your side
(no need to make any change to the Zimbra's postfix smtp settings)