12 Apr
2010
12 Apr
'10
8:10 p.m.
That says the submit server's IMAP client must support STARTTLS+SASL PLAIN authentication.
Yes.
Which is exactly the opposite of what X-PLAIN-SUBMIT does.
X-PLAIN-SUBMIT is intended to allow a submission server to connect to the IMAP server, send STARTTLS, and then authenticate using a plain-text password -- even when PLAIN is disabled for normal users. Nothing more. We just didn't want URLAUTH to break when the administrator shuts down PLAIN auth.