AOL rejecting mail from IP's w/o reverse DNS?

Dave Temkin dave at
Wed Dec 3 20:01:31 UTC 2003

You mean like Level3?

-----Original Message-----
From: owner-nanog at [mailto:owner-nanog at] On Behalf Of
Steven M. Bellovin
Sent: Wednesday, December 03, 2003 2:27 PM
To: Matthew Crocker
Cc: Christopher X. Candreva; nanog at
Subject: Re: AOL rejecting mail from IP's w/o reverse DNS ?

In message <01D22399-25C5-11D8-940C-000A956885D4 at>, Matthew

>AOL says the PTR record needs to be assigned.  It doesn't specify it
>has to match the in the MAIL FROM: header.  Wouldn't it be
>enough to make sure every IP address you announce has a PTR and
>matching A record?  Hasn't this been a requirement for MANY services
>for MANY years?

Right -- and then folks will start creating wildcard PTR records...

		--Steve Bellovin,

David Temkin

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