MBOX-Line: From janssen at parc.com  Wed Mar 21 19:53:35 2007
To: imap-protocol@u.washington.edu
From: Bill Janssen <janssen@parc.com>
Date: Fri Jun  8 12:34:38 2018
Subject: [Imap-protocol] IMAP features: which clients use them? 
In-Reply-To: <07Mar20.114847pst."57996"@synergy1.parc.xerox.com> 
References: <07Mar20.114847pst."57996"@synergy1.parc.xerox.com>
Message-ID: <07Mar21.185340pst."57996"@synergy1.parc.xerox.com>

Here's a little-known fact about Apple Mail:  if you select SSL support
for IMAP, it actually will connect with SSL to the IMAP server, if and
only if the port is set to 993.  If you specify any other port to
Apple Mail, and check the SSL checkbox, it will connect in the clear,
and attempt to do STARTTLS.  If the server doesn't, in its
CAPABILITIES string, indicate STARTTLS, it will simply issue a LOGOUT
and disconnect.

Bill

