14 Oct
How to Debug SMTP with TLS(SSL) and AUTH
The first thing to test is a TLS (aka SSL) connection. The stunnel program has special code for this, the command “stunnel -n smtp -c -r mail.example.com:25” will connect to the server via SMTP and negotiate SSL.
Once that is done and you will receive a 220 message acknowledging the connection (which is the same [...]
