OpenSSL
Verifica se SSL (e/o TLS) funziona:
- smtp + TLS (porta 25)
openssl s_client -CApath /etc/ssl/certs -connect mail.qualcosa.it:25 -starttls smtp
- smtps (porta 465)
openssl s_client -CApath /etc/ssl/certs -connect mail.qualcosa.it:smtps
openssl s_client -CApath /etc/ssl/certs -connect mail.qualcosa.it:25 -starttls smtp
openssl s_client -CApath /etc/ssl/certs -connect mail.qualcosa.it:smtps