The single most powerful and most efficient spam filter test is to verify DNS consistency. Judging by the spam now swamping these lists, Debian does not employ such a test.
In Postfix, including reject_unknown_client_hostname at an appropriate spot in smtpd_client_restrictions does the trick. Alternatively, us old PERL bashers iterate over all PTR records for the IP address, and for each of those PTR records we iterate over all the A records, and we only accept the connection if at least one of those A records contains the connecting IP. Unfortunately, once Debian has accepted this garbage and forwarded it to a million victims, its much harder to block. --Mike Bird -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
