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MTA sends SMTP-Packets without an IP-Address (


in the last few days we have repeatedly had the problem that the MTA has sent the SMTP-Packets to our internal Exchange-Server without an IP-Address ( We use version 19 (SFV4C6 / 19.0.0-B317) as VM in Hyper-V.

We can only solve the problem by restarting the service with the following command:

  • service smtpd:stop -ds nosync
  • service smtpd:start -ds nosync

However, restarting the firewall does not solve the problem.

Does anyone have an explanation for this? Unfortunately, as is so often the case, Sophos-Support was unable to help us.


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