I'm failing to get my Nokia 6682 to play nice with my Postfix SMTP server. The problem is that the phone connects to the server, says EHLO [ip address] and after the server responds with the usual list of extensions, the phone says QUIT, without ever attempting to send a message. Here's what the conversation looks like exactly:

220 (my hostname) ESMTP Postfix
EHLO [(ip addr)]
250-(my hostname)
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250 8BITMIME
QUIT
221 Bye

Is it possible that one or more of these options is upsetting the phone?

Got a bit of a lead to go on now... the problem goes away if i turn off security entirely. I had turned it on (selecting ports 993/995) to get it to use SSL to talk to IMAP, so I'm guessing it wants some kind of SSL extension to SMTP as well... but I have no idea what it's looking for.

Found the trouble.

If you configure the 6682 to use security, it expects it not only on IMAP and POP3 (like the 993/995 setting seems to imply) but also on SMTP. The mail server must be configured to support TLS and respond with 250 STARTTLS. Then it works great!

Hope this helps anybody else experiencing and troubleshooting the same problem.