[ale] Sendmail relay problem

[kaboom at gatech.edu (Chris Ricker)]

On Thu, 13 Jun 2002 sangell at nan.net wrote:

> 
> That might work internally but what about from outside of that network. I
> have the mail server behind a firewall on a 192.168.0.x subnet, am port
> forwarding to the mail box and am using dynamic DNS have a registered
> domain pointing to my network. I am wanting select individuals to be able
> to connect to the server via the internet and whatever client they wish to
> use.
> Won't adding the "192.168.0     RELAY"  only help me if I am at home? Maybe
> I am missing something in the way sendmail authorizes relaying but that
> looks like it would only work on the local subnet.

If you don't know the IP addresses which you want to allow to relay (road
warrior situation), you're going to have to set up one of:

POP before SMTP
SMTP Auth
SMTP StartTLS

and allow relaying for your local subnet and for remote clients who have
authenticated themselves using one of those three.  Anything else will make
you an open relay, which will make you a source of spam, cause me to block
all emails from your server, etc.

later,
chris


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