[FW-1] SPAM relay detection through FW-1

["Peter G. Viscarola" <PeterGV@FW1-NOSPAMOSR.COM>]

FW-1 V4.1, sp 5, with IPSO 3.4.1-FCS5

We're swamped with SPAM.

We have the SMTP security server set up on our FW1, and it's properly
configured to avoid relaying.

Our SMTP server has anti-spam software that checks for mail coming from
known evil hosts via the RBL and ORBS.

Unfortunately, checking for open relays doesn't work because the point of
last relay is always our firewall.

Is anyone aware of a way to "fix" this?  Is there open relay checking
software that can (reasonably) run on the FW1?  I realise that I can disable
the SMTP security server and pass mail directly through to our mail server,
but I sort of hate to do this.

How do people normally accomplish this?  Any advice you can share?

Thanks mucho,

Peter Viscarola
A Windows Software Developer, who also gets to manage the FW-1 "in his spare
time"

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