Posted in MailCheck Mail Server Support SSL/TLSby TechHubWriter•October 3, 2024•0 To check if a mail server support SSL/TLS, run openssl s_client -connect MAIL_SERVER_IP:PORT -starttls smtp Example openssl s_client -connect smtp.elasticemail.com:25 -starttls smtp mail openssl Visited 1 times, 1 visit(s) today TechHubWriter More by TechHubWriter