Frank A. Kingswood writes:
HiI'm attempting to use TLS between my primary MX and the machine that actually receives and stores the emails. Both machines are running courier-mta, courier-mta-ssl 0.65 Forwarding fails when the sender disconnects, the receiver logs courieresmtpd: STARTTLS failed: DEBUG: Unexpected SSL connection shutdown. and the (locally generated) email simply stays in the mail queue. My esmtproutes contains :[11.22.33.44],25/SECURITY=STARTTLS (I've also tried :11.22.33.44,25/SECURITY=STARTTLS)
Did you follow all the instructions in INSTALL under "OPTIONAL: Configure the SECURITY ESMTP extension". This is a Courier-specific TLS extension, that requires you to set up your own certificate authority, and install certs signed by your certificate authority.
If all you want is unauthenticated TLS, remove the entry in esmtproutes.
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