[snip] ::If it's true that spammers don't have reverse DNS on their IP ::addresses, I wouldn't mind seeing the MTA adding a header like ::"X-Possible-Spam: Host 209.218.8.2 does not have reverse DNS." and even ::"X-Possible-Spam: Host 209.218.8.2 resolves to spam.com which does not ::resolve to 209.218.8.2". Then an email client could filter on that ::header or SpamAssassin could add a few points to the message's spam ::score. [/snip]
Tom, Blackhole spam/virus filter does both of these checks as well as header tagging. It can also be installed into qmail at the queue level or run via .qmail-default or .qmail files (in vpopmail > 5.2.1). http://iland.net/~ckennedy/blackhole.shtml It also integrates with Spamassassin with the latest version. (Although I haven't gotten it to work with the libspamc.so under FreeBSD yet.) Tom Walsh Network Administrator http://www.ala.net/
