[imp] how to get IMP to STARTTLS

Dieter Rothacker dr-tech@web.de
Mon, 25 Mar 2002 07:31:43 +0100


At 22:24 24.03.2002 -0500, Chuck Hagenbuch wrote:
>Quoting Curtis Doty <Curtis@GreenKey.net>:
>
> > Actually I want STARTTLS...which is different from imaps (imap over ssl
> > tunnel).
>
>You may be right and I may be missing a piece of information. First,
>though, have you tried using port 993? I know it's the imap/ssl port, but
>I'm pretty sure that that and the imap/ssl protocol handles TLS connection.
>
>I could very well be wrong, though, so feel free to ignore me if you
>already know otherwise.

My understanding until now was that STARTTLS is a way for the imap server 
to handle secure comm over port 143. It listens on port 143 for unencrypted 
comm and on receiving STARTTLS negotiates encryption. If it receives no 
STARTTLS it proceeds unencrypted.

On port 993, encryption is required so it does not have to wait for the 
client to advertise encryption capability like on 143.
But then again, in Eudora the 993/ssl is called "starttls, alternative 
port" :)) so, everybody gets confused?!
-- 
Dieter Rothacker