Zimbra Collaboration

zimbra admin console

Zimbra Collaboration
(network edition / open source)

> Admin Console

zimbra admin - configure - global settings - mta

Zimbra Administration

> Configure

> Global Settings


zimbra admin - mta - relay mta for externa ldelivery


Enable authentication [  ]
TLS authenticaton only [  ]


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)