Speaking of rDNS, check out this log entry (user name and sub-domain, obfuscated as 'fred').
Jan 10 09:09:02 intrepid sendmail[31995]: k0AH8pZE031992: to=<[EMAIL PROTECTED]>, ctladdr=<[EMAIL PROTECTED]> (1001/1001), delay=00:00:06, xdelay=00:00:03, mailer=esmtp, pri=151951, relay=mailhost.cotse.com. [216.112.42.58], dsn=4.0.0, stat=Deferred: 451 4.7.1 No RDNS: Sender IP address is not resolving: http://mail.cotse.net/cgi-bin/whitelist-request-form.cgi?h=nrdns ------------------------ The web page stats: Cotse.Net Whitelist Request Form You have been directed to this page either because your machine issued an attack on our server and was automatically blocked, because it has no rdns, or because it's rdns looks like an end user machine and not a mail server (due to massive numbers of spam zombied end user machines we've been forced to employ some common pattern matching). Fill out the form below to get automatically whitelisted. ------------------------ We're not on any RBL's, and haven't had any other complaints, so I assume they're being overly cuatious. Interesting approach though. PS: Although our name server handles the rDNS properly, however http://dnsstuff.com tells me that our upstream ISP-based NS does not. Perhaps that is what this site was complaining about. _______________________________________________ NOTE: If there is a disclaimer or other legal boilerplate in the above message, it is NULL AND VOID. You may ignore it. Visit http://www.mimedefang.org and http://www.roaringpenguin.com MIMEDefang mailing list MIMEDefang@lists.roaringpenguin.com http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
