who is using require_rdns.m4?

[Jeff A. Earickson]

Gang,

I've run require_rdns.m4 since about 10 EDT yesterday.  In the
last 24 hours, I've seen:

Yesterday (10 AM to midnight):
Total RDNS Fix Reverse DNS:    5889  (5xx fatal error)
Total RDNS no resolve:         378   (4xx tempfail)
Total RDNS Possible forgery:   4578  (4xx tempfail)

Today (since midnight):
Total RDNS Fix Reverse DNS:    6327
Total RDNS no resolve:         426
Total RDNS Possible forgery:   4214

The bulk of the "no reverse DNS" fatal rejections came from APNIC numbers.
As for the issue of one IP number hosting multiple names, I believe that
this test can be eliminated from require_rdns.m4 by removing the line that
contains "451 Possibly forged hostname for $1".  Per suggestions here, I
have done that to my setup.

I have heard nothing but silence from our helpdesk since installing
require_rdns.m4 yesterday.  No complaints or queries.  We are a college,
and lots of people are gone so it is quiet now anyway.  But people howl
quickly about email issues.

Despite opinions to the contrary here, maybe require_rdns is not such a
bad idea for anti-spam.

BTW, upgraded to SpamAssassin 3.0.4 with MailScanner 4.43.2.  No problems.
I commented out the URIBL_JP_SURBL stuff in spam.assassin.prefs.conf as
part of this upgrade.

Jeff Earickson
Colby College

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