Hello,
I've just installed a new Courier instance in a new Debian GNU/Linux 9
amd64 server from distro packages.
This Courier should act as smart relay for another server and nothing else.
So far I've enabled courier-mta and courier-msa systemd services,
changed the ports they listed on and created a real system account for
mail relay (authpam). I've also let
TLS_VERIFYPEER=NONE
in /etc/courier/courierd.
Then I tested the smarthost from Thunderbird, by configuring it as
outgoing server. It does not work. When TB tries to send a message, it
connects to the non-default MSA port, it starts talking to the server
(STARTTLS) for a few seconds, then it fails for "unknown reason".
Server-side, in the logs, I get:
Jul 19 04:48:17 mrelay courieresmtpd: started,ip=[::ffff:80.180.158.103]
Jul 19 04:48:18 mrelay courieresmtpd: courieresmtpd: STARTTLS failed:
Certificate is bad
I don't know what to try next.
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