Ricardo Kleemann wrote:
>> What's connecting to Courier and starting the TLS session?
>>
> I believe it's msmtp, from one of my clients.

You can test various protocol settings with openssl's "s_client".  See 
which of these work:

openssl s_client -starttls smtp -connect localhost:25 -ssl2
openssl s_client -starttls smtp -connect localhost:25 -ssl3
openssl s_client -starttls smtp -connect localhost:25 -tls1

You should also check *all* of your configuration files for TLS_PROTOCOL 
and TLS_STARTTLS_PROTOCOL.  Neither of those settings should have values 
unless you understand what they do, and you have specific security 
requirements:

grep ^TLS_PROTOCOL *
grep ^TLS_STARTTLS_PROTOCOL *

If you modify either of those values in any configuration file, restart 
Courier.


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