VERY interesting David and nice idea.

Chuck

-----Original Message-----
From: pctech-bounces@xxxxxxxxxxxx [mailto:pctech-bounces@xxxxxxxxxxxx] On
Behalf Of David Gibbs
Sent: Thursday, May 22, 2008 4:12 PM
To: PC Technical Discussion for iSeries Users
Subject: [PCTECH] Dummy backup MX

Folks:

I'm currently running an experiment with backup MX's.

I've always been of the opinion that some spammers will target a backup
MX if one is available, with the assumption that the backup is less
protected against spam & viruses than the primary.

As such, I've setup a backup MX for midrange.com and am running
'smtptrapd' (http://smtptrapd.sourceforge.net/) on it.

smtptrapd is a very small C program that listens on port 25 and always
returns a 4xx soft error to the RCPT TO verb.

I setup the backup MX record in DNS about 2 hours ago ... and already
I'm getting hit on it. So far I haven't seen a single legit email show
up on it.

Theoretically I could just have nothing listening at all on the backup
MX system, but I want to see what tries to deliver to it.

david


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