To connect using the TLS protocol on port 587, use:[darksharavim]openssl s_client -starttls smtp -connect smtp.mail.nate.com:587 smtp-ssl(465)[darksharavim]openssl s_client -connect smtp.mail.nate.com:465 imap-ssl(993)[darksharavim]openssl s_client -crlf -connect imap.nate.com:993https://stackoverflow.com/questions/14959461/how-to-talk-to-imap-server-in-shell-via-openssl How to talk to IMAP serv..