puRe1337

Test commands with openssl

SMTP 25

openssl s_client -quiet -crlf -starttls smtp -connect mail.example.com:25

SMTP 587

openssl s_client -starttls smtp -quiet -crlf -connect mail.example.com:587

SMTP 465

openssl s_client -quiet -crlf -connect mail.example.com:465

IMAP 143

openssl s_client -crlf -connect mail.example.com:143 -starttls imap -servername mail.example.com