Re: ETRN service

[Brian Candler <B.Candler at pobox.com>]

On Fri, Jul 19, 2002 at 12:20:55PM +0300, Noah K Sematimba wrote:
> > I remenber that I've build my own rpm from postfix-1.1.10.tar.gz.
> > Please did my customer need a dedicate IP adress?
> 
> Yes. You give him a dedicated ip address and then you set up his mx
> records in the following way:
> 
> customer_domain.	IN MX 10 mail.customer_domain.
> 		IN MX 20 your.smtp.server.
> mail.customer_domain	IN A x.x.x.x

This is a problem where I work too - those people who need SMTP delivery are
currently on static IPs. This limits the number of these people, and it
doesn't scale well since all their mail is intermingled in a single mail
spool.

A better solution is ATRN, or On-Demand Mail Relay (RFC 2645). This allows
the client to connect, authenticate, issue ATRN, and the mail flows down the
_same_ TCP connection (whereas ETRN opens a new TCP connection). That makes
it safe in a dynamic IP environment, in fact it's not very different from
POP3. However, I'm not sure how much client support there is for ATRN yet.

Regards,

Brian.

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