On 2013-03-13 12:37 AM, Alex mysqlstudent@gmail.com wrote:
Is it conventional to use port 143 for encrypted IMAP connections these days, and not just 993?
Port 143 uses STARTTLS, port 993 uses SSL/TLS... been that way for a long time, and yes there is a (slight) difference. STARTTLS *begins* as an unencrypted session, but immediately negotiates the encrypted session. SSL is encrypted from the very beginning of the connection.
I'm finding that port 25 works with TLS and postfix now too, not just port 587, so I'm really confused.
Both ports 25 and 587 have always worked with STARTTLS... although unless you have a very, very specific need, you will never FORCE STARTTLS on port 25, unlike port 587 where you (should) always *require* it.
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Best regards,
Charles