Until exim connects to the smarthost with implicit TLS, I think of having a non-TLS MUA send messages to the smarthost directly through the stunnel tunnel. As mentioned a few days ago, the analogue for POP3 works with no difficulty.
If I try to remove exim, the system will complain about absence of MTA. So I think of leaving exim installed. It uses port 25 for local submission. What port is suggested for submission through the tunnel? Any unused port in the dynamic, private and ephemeral range? Eg. 49160? Thx, ... P.
