On 11/06/2021 21:01, Rowney, Dion via Exim-dev wrote:
If my replacement system I see the bounces are returning 
toboun...@myeximserver.com<mailto:boun...@myeximserver.com>

And I see the following in the logs:

Jun  7 17:28:52 test  exim[32705]: 2021-06-07 17:28:52.615 [32705] 1lqOfs-0008VV-Jb <= <> 
H=mailtestmta.test.domain.com (mail.test.domain.com) [123.123.215.233]:48218 I=[123.123.215.121]:25 P=esmtps L. 
X=TLS1.2:ECDHE-RSA-AES256-SHA384:256 CV=no K S=34927 M8S=0 
RT=0.005sid=e1lqofo-000vfk...@list.domain.com<mailto:id=e1lqofo-000vfk...@list.domain.com>  T="Mail 
delivery failed: returning message to sender" from <> for 
boun...@test.domain.com<mailto:boun...@test.domain.com>

So are you sending with an envelope-from of
boun...@test.domain.com<mailto:boun...@test.domain.com>
?

If so, and you are not accepting that as a valid address, you
need to change one or the other.

Please don't obfuscate.  It makes it harder to help you.
--
Cheers,
  Jeremy

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