[PLUG] Email Encryption Problem

[Casey Bralla via plug <plug@lists.phillylinux.org>]

I'm trying to quickly rebuild a simple eMail server since my existing 
Debian 9 server is being shut down.

As many of you probably realized, cloning the old disk wouldn't work 
since the hosting company's system was now incompatible with a 6 year 
old Debian system.

So I've been building a Postfix/Dovecot system (no spam control or 
anything fancy)

But I'm stuck on the encryption for STARTTLS

I've gotten certificates from Let's Encrypt, and also tried creating my 
own self-signed certificates.  Everything looks ok, but when I try to 
test STARTTLS encryption from a remote system, it shows me a valid 
certificate, but then chokes with a "premature EOF" error.

# openssl s_client -starttls smtp -connect postfix.nerdworld.org:587

I believe this has something to do with version 3.x of OpenSSL, but 
don't know what to do to make it work.  When I try to connect from 
Thunderbird, I can get to the eMail account on the new server, but not 
retrieve or send eMails.

Anybody got any ideas?

My old server goes dead on Saturday morning, so I've got to get this 
figured out ASAP.

Very Thanks in Advance!

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