You should check with the packagers as to what their intent is. Running Exim non-suid
is definitely more tricky; it traditionally needs privilege for some operations
(including opening the SMTP socket for listen, and for delivery into user's mailboxes).
There is a docs chapter that discusses this:
https://exim.org/exim-html-current/doc/html/spec_html/ch-security_considerations.html#SECTrunexiwitpri
--
Cheers,
Jeremy
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