Re: [Exim] TLS on a port other than 25

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Author: Philip Hazel
Date:  
To: James P. Roberts
CC: exim-users
New-Topics: SSL/TLS recipe (was Re: [Exim] TLS on a port other than 25)
Subject: Re: [Exim] TLS on a port other than 25
On Sat, 15 Feb 2003, James P. Roberts wrote:

> I ran into a similar problem. It has to do with the fact that in M$
> Outlook Express (and probably other M$ mail clients), when you check the
> box to use encrypted connections, it ONLY uses TLS on port 25, but
> instead switches to using SMTPS if you use any other port. (Talk about
> an undocumented "feature"... geeez).


Aarrgghh!! That sounds like it. Hells Bells...

> I await the day that Exim can be asked to listen for different
> encryption protocols on different ports. Perhaps it already can; I
> simply haven't looked at changing my process, because it is currently
> working. ("If it ain't broke...")


No it doesn't, and it is unlikely to, since the only standard protocol
for email is ESMTP, which uses the STARTTLS mechanism to initiate
encryption.

The only facility is -tls-on-connect, for legacy clients that use smtps.
The recommendation is to use inetd to handle this "second version of
Exim", which of course doesn't actually have to be a second version.

--
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.