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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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  • FormerMember
    0 FormerMember

    Hi  

    Thank you for reaching out to the community!

    To investigate your issue further, we need to check smtpd_main logs in debugging.

    Follow this KB Article to get SSH access: Sophos XG Firewall: How to SSH to the firewall using PuTTY utility

    • Type 5 and then 3 to access the Advanced shell.
    • Run this command to put smtpd service in debug: service smtpd:debug -d -s nosync
    • Replicate the issue and collect smtpd_main.logs by running: tail -f smtpd_main.log

    Note: Run the same command to remove debug. 

    Provide these logs via PM or post it on this thread.

    Thanks,

Reply
  • FormerMember
    0 FormerMember

    Hi  

    Thank you for reaching out to the community!

    To investigate your issue further, we need to check smtpd_main logs in debugging.

    Follow this KB Article to get SSH access: Sophos XG Firewall: How to SSH to the firewall using PuTTY utility

    • Type 5 and then 3 to access the Advanced shell.
    • Run this command to put smtpd service in debug: service smtpd:debug -d -s nosync
    • Replicate the issue and collect smtpd_main.logs by running: tail -f smtpd_main.log

    Note: Run the same command to remove debug. 

    Provide these logs via PM or post it on this thread.

    Thanks,

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