Anybody aware of SMTP AUTH tunnel software?

From: Jem Berkes (jem_at_users.pc9__org)
Date: 11/30/03 

Date: 29 Nov 2003 23:10:05 GMT

I'm probably not the only one who has run into this situation. The SMTP
server through which I want to send my outgoing mail uses SMTP AUTH to
authenticate sending rights.

While it's possible to set up sendmail and postfix to use SMTP with TLS and
AUTH I would rather use a tunnel approach to handle these layers, allowing
any plain SMTP compliant software to reach the mail server that needs
authentication.

Is anyone aware of such an SMTP AUTH tunnel program? If none exists, I
might write one over the holidays since I already have written the required
code in my JBMail software.

The way this could work is as follows. Your SMTP-compliant software
(whatever it may be) could connect to localhost:1234, reaching the tunnel
program. The tunnel would then establish a connection to
mail.example.com:25 and transfer all SMTP communications verbatim, except
that it would insert the AUTH command to authenticate to the remote server.
The tunnel therefore needs to do very little; other then the AUTH command,
all other data lines are transmitted unmodified. 

-- 
Jem Berkes
http://www.sysdesign.ca/

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