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how to stop SMTP Open Relay

Satya T

Hi Team, Good Morning. 

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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    Hi Satya,

    This is the UTM Community - you will want to post your question in the XG Community instead.

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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