mail from external servers connecting but timing out after tls established. t.s.

[Thomas Strike]

External smtp servers time out after tls v1.2 is established. the 
following is from the maillog;

May  8 17:40:48 sleepyvalley postfix/smtps/smtpd[17534]: connect from 
unknown[185.50.149.12]
May  8 17:40:50 sleepyvalley postfix/smtps/smtpd[17534]: Anonymous TLS 
connection established from unknown[185.50.149.12]: TLSv1.2 with cipher 
ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
May  8 17:40:56 sleepyvalley postfix/smtps/smtpd[17534]: lost connection 
after EHLO from unknown[185.50.149.12]
May  8 17:40:56 sleepyvalley postfix/smtps/smtpd[17534]: disconnect from 
unknown[185.50.149.12] ehlo=1 commands=1

I set up certificates with letsincrypt. If these crets are wrong, would 
that cause this type of behavior?


Thanks, Tom