Understanding SMTP TLS and SSL

Understanding SMTP TLS and SSL

Postby stephen » Fri Feb 13, 2009 8:34 am

For a description of this topic see:-
SSL versus TLS versus STARTTLS
http://sial.org/howto/openssl/tls-name/

The following are common ports used by e-mail, web, and directory services.
smtp 25/tcp Simple Mail Transfer

http 80/tcp World Wide Web HTTP

pop3 110/tcp Post Office Protocol - Version 3
imap 143/tcp Internet Message Access Protocol

ldap 389/tcp Lightweight Directory Access Protocol

https 443/tcp http protocol over TLS

smtps 465/tcp #smtp protocol over TLS (was ssmtp)
submission 587/tcp Submission for Simple Mail Transfer

ldaps 636/tcp sldap #ldap protocol over TLS

imaps 993/tcp # imap4 protocol over TLS
pop3s 995/tcp # pop3 protocol over TLS
stephen
 
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