So I recently upgraded Debian 10 to Debian 11, and since then Exim4 is completely broken.
Whenever an email is sent it gets rejected, and in the “paniclog” I can see something like this:
Tainted filename for search '/etc/exim4/domains/mydomain.com/aliases'
In the “mainlog” I can see some more detail:
2022-01-04 23:23:07 Tainted filename for search '/etc/exim4/domains/mydomain.com/aliases'
2022-01-04 23:23:07 H=(webmail.mydomain.com) [127.0.0.1] sender verify defer for <[email protected]>: failed to expand "${extract{1}{:}{${lookup{$local_part@$domain}lsearch{/etc/exim4/domains/$domain/aliases}}}}": NULL
2022-01-04 23:23:07 H=(webmail.mydomain.com) [127.0.0.1] F=<[email protected]> A=dovecot_login:[email protected] temporarily rejected RCPT <[email protected]>: Could not complete sender verify
I’m not sure where to start debugging this. My Exim version is the following one: Exim version 4.94.2 #2 built 13-Jul-2021 16:04:57
It seems that the Exim4 version is the issue as seen here ( Error sending email - Hestia Control Panel - Hestia Control Panel - Discourse (hestiacp.com)), but there is no solution provided and there is not really a way to downgrade it given that it’s shipped with Debian 11.
Anybody knows how to fix or debug this to get it fixed? Thanks.