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return-path address rejected

We're receiving some interesting bouncebacks going through the Email Gateway, but unfortunately there are absolutely no logs on the traffic. Has anyone else seen these errors?

Failed to deliver to''
SMTP module(domain reports:
return-path address <> rejected by
221 Service closing transmission channel closing connection


The return path header indicates another hosted provider, that does not match the actual sending domain. Again, the Email Gateway has no logs of rejecting the traffic whatsoever, so I don't know how to adjust the config.



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Re: return-path address rejected

Do you have "Reject Invalid MailFrom" enabled under Intrusion Defender -> smtpi service?

Re: return-path address rejected

No, we do not have that enabled.