[67328] in North American Network Operators' Group
Re: question on ptr rr
daemon@ATHENA.MIT.EDU (Randy Bush)
Sun Feb 8 11:51:18 2004
From: Randy Bush <randy@psg.com>
To: Suresh Ramasubramanian <suresh@outblaze.com>
Cc: nanog@nanog.org
Date: Sun, 8 Feb 2004 11:50:44 -0500 (EST)
Errors-To: owner-nanog-outgoing@merit.edu
> Now, from your logs, just how much legitimate mail do you get that comes
> from an IP without PTR RR, and how much is that expressed as a
> percentage of legitimate incoming mail to your lists? How much is that
> as a percentage of spam inbound to your list [to be fair, let's make it
> "spam that would not have been stopped by your other filters]?
well, it's gonna be hard to quantify what spam filters, bounces,
... rejected, and especially to associate them with smtp connections.
but here are some simple data.
yesterday, a saturday (gmt clock)
48293 total incoming smtp connections
6226 from ip addresses for which no ptr exists (12.89%)
12416 unique ip addresses which connected to server
3112 unique ip addresses for which no ptr exists (25.06%)
some inferences might be drawn, but i am hesitant to do so.
what numbers do YOU have for your server(s)?
randy
