September 3rd, 2003, 02:35
Found this funky lil Perl script at http://www.yoobay.net/grinch/

From the page:

What is grinch?
Grinch is a small daemon written in perl that can be used to check whether a given address is an open mail relay host.

The goal is to check "on the fly" whether a host accepts mail to a given destination it actually may not relay for. If it does, grinch waits for the sent mail to return to you for a configurable period and meanwhile returns a soft error (450) for that host.
If the mail returns, the suspected host was verified as an open open relay and will be rejected until it's cache entry times out.

Nifty eh?

September 3rd, 2003, 02:44
Cool! Thanks for the link Loop!