Mark Constable writes:

I just set up a new server and I can't for the life of me remember,
or find, how to disable SSL on port 25 for general incoming mail?

Some lame govt mailservers are still using SSL23...

SSL23_GET_SERVER_HELLO:tlsv1 alert decode error

and rather than whitelist them I'm sure I used to just disable SSL
via /etc/courier/esmtpd altogether (currently using v0.68.2)...

~ egrep -v "^(#|$)" /etc/courier/esmtpd
PATH=/usr/bin:/bin:/usr/bin:/usr/local/bin
SHELL=/bin/bash
ULIMIT=32768
BOFHCHECKDNS=1
BOFHNOEXPN=1
BOFHNOVRFY=1
TARPIT=1
NOADDMSGID=1
NOADDDATE=1
ESMTP_LOG_DIALOG=0
AUTH_REQUIRED=0
COURIERTLS=/usr/bin/couriertls

Remove the COURIERTLS setting.

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