thoughts - rfc2645 (ODMR) + qmail

[Markus Stumpf <maex-qmail@xxxxxxxxx>]

A customer asked about ODMR (On Demand Mail Relay - SMTP with Dynamic IP
Addresses) support. Think of ETRN but with dynamic IP addresses.
Authentification is accomplished via the SMTP AUTH extension. 

After thinking about it for a while I had the idea it might work with
qmail-smtp + AUTH patches and a combination of serialmail/maildirserial.
My idea is
   - put all email for a domain in a maildir (i.e. like with AUTOTURN as
     described in the ucspi package)
   - set up tcpserver + qmail-smtpd + SMTP AUTH
   - as "program" to checkpassword use a script that does something
     like
	cd /var/autoturn/$USER
	/usr/local/bin/maildirserial -b -t 604800 -- "." ${USER}- \
	    /usr/local/bin/serialsmtp ${USER}- `cat /var/qmail/control/helohost`

IMHO this would be a rather elegant solution.
The problem that remains is how to "connect" the network sockets to
the script (serialsmtp).

One would probably have to write a "connector" client that connects FD 0/1
of qmail-smtpd/checkpassword to 6/7 of serialsmtp and somehow
feed the output of maildirserial to serialsmtp also. Could this be done?
(I'm not too familiar with mangling fd's around ;-)
This "connector" would also have to handle the (easy) task of waiting
for a ATRN command and sending a "250 OK".

Comments? Has anyone done it already?

	\Maex

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