nanog mailing list archives
Re: Reverse DNS RFCs and Recommendations
From: "John Levine" <johnl () iecc com>
Date: 31 Oct 2013 15:13:02 -0000
Mail admins wanting matching forward/reverse DNS and hostnames that don't "look dynamically generated" is probably more of a human than an RFC thing:
Right. Spam filtering depends on heuristics. Mail from hosts without matching forward/reverse DNS is overwhelmingly bot spam, so checking for it is a very effective heuristic. Mail from hosts with names that look dynamic is also quite spammy, but figuring out what looks dynamic is quite hard. I know someone who's been tuning his regexes for years. For most people, third party lists like the Spamhaus PBL are more reliable. R's, John
Current thread:
- RE: Reverse DNS RFCs and Recommendations, (continued)
- RE: Reverse DNS RFCs and Recommendations Nolan Rollo (Oct 30)
- Re: Reverse DNS RFCs and Recommendations Joe Abley (Oct 30)
- Re: Reverse DNS RFCs and Recommendations Scott Howard (Oct 30)
- Re: Reverse DNS RFCs and Recommendations Mark Andrews (Oct 30)
- Re: Reverse DNS RFCs and Recommendations William Herrin (Oct 30)
- Re: Reverse DNS RFCs and Recommendations Valdis . Kletnieks (Oct 30)
- Re: Reverse DNS RFCs and Recommendations Barry Shein (Oct 30)
- RE: Reverse DNS RFCs and Recommendations Nolan Rollo (Oct 30)
- Re: Reverse DNS RFCs and Recommendations Matthias Leisi (Oct 30)
- Re: Reverse DNS RFCs and Recommendations John Levine (Oct 31)
- RE: Reverse DNS RFCs and Recommendations Tony Hain (Oct 31)
- Re: Reverse DNS RFCs and Recommendations John Levine (Oct 31)
- Re: Reverse DNS RFCs and Recommendations Scott Howard (Oct 31)