From: Randy Bush (no email)
Date: Sun Feb 08 2004 - 11:50:44 EST
> 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
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