Test your server SSL using OpenSSL cli

HTTPS
   openssl s_client -connect mail.yourserver.com:443

IMAPS
   openssl s_client -connect mail.yourserver.com:993

POP3S
   openssl s_client -connect mail.yourserver.com:995

POP3 TLS
   openssl s_client -connect mail.yourserver.com:110 -starttls pop3

IMAP TLS
   openssl s_client -connect mail.yourserver.com:143 -starttls imap

SMTPS
   openssl s_client -connect mail.yourserver.com:465

SMTP TLS
   openssl s_client -connect mail.yourserver.com:587 -starttls smtp




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