Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.

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Sophos XG acting as Open Relay

Dennis Braun

Hey Community,

I´ve got a probleme which I don´t know how to fix, maybe some of u can help me!

I´ve created a MTA on my Sophos XG 18 which receive and send Mails for my Exchange 2016.

Now I have checked my mail flow and to my suprise mxtoolbox said it could be an open relay and yes, it is.

Here is my configuration, maybe I´ve overlooked something.

Where is my probleme?!

Many thanks



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    This configuration looks fine to me. There should be no reason, the MTA is accepting and allowing anything else to send Emails beside your hostbased Relay.

    You could disable MTA mode and reenable it - Test it again. 

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  • 0

    This configuration looks fine to me. There should be no reason, the MTA is accepting and allowing anything else to send Emails beside your hostbased Relay.

    You could disable MTA mode and reenable it - Test it again. 

    __________________________________________________________________________________________________________________

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