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Outbound mail from MTA not working

Nathan_K

Been using Sophos for a long time. Started on UTM back in the Astaro days. Love the product. Switched everything over to XG a little over a year ago, but have had issues around the MTA, so most of my mail is still flowing through my UTM.

 

When I set my outbound to go through my XG, the mail gets stuck in the outbound mail queue, the log says "queued for scanning" and just sits there. Several days later, I get a "Failure" notice in my inbox due to excessive retries. There are no other entries in the log.

 

The Undeliverable comes back with a "Remote Server returned '< #5.0.0>'" and the headers in it are not helpful in the least. The only thing I can see is that my tests seem to all be using IPv6, which I do have setup and fully functional.

 

Any help is greatly appreciated.



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  • 0 in reply to LuCar Toni

    LuCar Toni said:

    Do you have a MTA Scanning Rule in your Firewall Ruleset? 

    Can you edit this rule and place a MASQ in this rule? 

    There should be something "ANY - ANY - SMTP" in your Ruleset as Business Application Rule. 

     

     

    Yes, I am doing outbound scanning. I have the default auto-generated rule on the IPv6 side, but the XG seems to neglect a lot on the IPv6 side and doesn't auto-generate rules there, and there is no way to setup the same rule on the IPv6 side. The auto-generated rule is quite a bit different from rules you can create. I tried turning off outbound scanning to test, but didn't see any difference in testing results.

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