We have settled on a solution in the case. If we have time to implement it in 11.34 we will try to get it in there.+1 for mtindor's comments. I came here looking for help with the same "error". Confusing and misleading.
The "check_mail_permissions could not determine the sender domain" warning message you see in /var/log/exim_mainlog is explained in this post:- When a message is forwarded off server via a valiases file, the sender is now set to the owner of the forwarder.
- Forwarded messages are now counted against the email hourly limit.
- Ensured that forwarded messages do not get their "From:" header re-written.
There's no plan to remove that message from /var/log/exim_mainlog as best I can tell, as it's an accurate message.The warning just means that a message could not be assigned to a user for accounting purposes ( mail delivery reports and email send limits.)
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