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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how to stop SMTP Open Relay

Satya T

Hi Team,

I need help to stop the SMTP open Relay on Sophos XG Firewal..

I have installed zimbra mail server and nated  public ip through Sophos XG firewall and it is working but now some one using my smtp server to send emails as smtp open relay is allowed.

 

I followed below link to stop  SMTP open relay but now emails are failing with following error message: "mail for outlook.com loops back to myself"

https://community.sophos.com/kb/en-us/125596 

 

I found above issue due to entered the SMTP hostname in General settings. if i remove the  SMTP hostname mails are rejecting and saying domain does not match with ip.

Could you please suggest how to stop SMTP open relay. 



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