On Wed, 4 Feb 2004, Mark wrote: > I am actually rather pleased with the result. :) It seems quite an effective > early-out mechanism to weed out spam at the SMTP stage. And it feels pretty > benign too; it requires no PTR; but if one is present, with a country-code > TLD not matching a present HELO country-code, then, and only then, I cry > spam.
If you restrict it to country codes, it might be pretty safe. However, I can easily see a host identifying itself as "foobar.net" resolving to "foobar.com" on the reverse lookup. I coded up your rule; right now, it just logs a message, but if it looks good, I'll use it. Thanks! Regards, David. _______________________________________________ Visit http://www.mimedefang.org and http://www.canit.ca MIMEDefang mailing list [EMAIL PROTECTED] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
