On Fri, 10 Dec 2004 22:03:20 +0000, JanC wrote: > Stuart D. Gathman schreef: > >> I have a function that recognizes PTR records for dynamic IPs. There
> Did you also think about ISPs that use such a PTR record for both dynamic > and fixed IPs? There seems to be a lot of misunderstanding about this. I am not blocking anyones mail because they have a dynamic looking PTR. I simply don't accept such a PTR as MTA authentication. You see, MTAs *SHOULD* provide a fully qualified domain as their HELO name which resolves to the IP of the MTA. Sadly, however, many internet facing MTAs don't do this, but I accept a meaningful PTR as a substitute. I also waive the requirement for MTA authentication if the MAIL FROM has an SPF record (http://spf.pobox.com). So, if your MTA complies with RFC HELO recommendations, you'll have no trouble sending me mail. You can even use a dynamic IP with a dynamic DNS service. I 'do* block PTR names of "." or "localhost". I would like to block all single word HELO names - but there are too many clueless mail admins out there. People seem to be unsure of what to send for HELO. -- Stuart D. Gathman <[EMAIL PROTECTED]> Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154 "Confutatis maledictis, flamis acribus addictis" - background song for a Microsoft sponsored "Where do you want to go from here?" commercial. -- http://mail.python.org/mailman/listinfo/python-list
