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Chilkat Tech Notes

Chilkat Software Tech Notes

    May 30, 2008

    Port 465 is Normally the Implicit SSL SMTP Port, but not always…

    If you open a DOS prompt and telnet to an SMTP server (typically port 25 for non-SSL, port 465 for SSL), you should get a human-readable printable-text “HELLO” message from the non-SSL port, but binary SSL-handshake protocol gobbly-gook from an implicit SSL port. For example: > telnet mail.chilkatsoft.com 25 220 mail.chilkatsoft.com ESMTP MailEnable Service, Version: 0-1.85- ready at 05/30/08 08:04:19 […]

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