🚀 go-pugleaf

In article <01bbdfab$e13e9fc0$0100007f@wolf.compulink.co.uk>, Paul Smith
<Paul@wolf.cix.co.uk> writes

>I've been experimenting with my software (VPOP3) and the beta POP3 server
>at Demon, and I've encountered a slight problem. As mentioned elsewhere,
>VPOP3 has both clients & servers for both POP3 and SMTP.
>
>VPOP3 connects to Demon Internet, and connects to the POP3 server to
>retrieve messages, however, at the same time, the SMTP client at Demon
>starts sending the same messages to the SMTP server in my software. Now,
>this is a bit undesirable, since I end up with two copies of every mail
>message...

even more undesirable, you may get dummy messages from the POP3 if the
mail has already been delivered by SMTP  :-(

>Is there any way of stopping connections from the SMTP client if I'm
>connecting to the POP3 server? 

turn off the SMTP server

>An easy way would be to reject connections from the SMTP client at Demon.
>To do this, however, I'd need to know the IP address.

seems a bit wierd ...  if you are calling as a Demon dialup host there
are MX records pointing solely at the demon machines. Only extremely
broken mailers will be delivering directly to your machine. So turning
off the server altogether will lose you nothing.

> Currently it appears
>to be 194.217.242.1 (at least it has been for several connections). Is this
>fixed or is it likely to change?

all the Demon mail delivery clients live at 194.217.242.0/24 (see
demon.announce passim)

> Is there any better way of doing this?

turn off the server - see above

>Would it be better to reject any connections which send 
>'HELO xxxxx.mail.demon.net' ?

no - if you believe that people will deliver to your A record then you
should believe that they will lie about their identity in HELO messages

-- 
richard                      richard.clayton    @    T U R N P I K E .com
                                                     tel: +44 1306 732300
"Assembly of Japanese bicycle require great peace of mind" quoted in ZAMM