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Article: 240
From: Willi Burmeister
Date: 2004-11-11 02:43:32 -0500
Subject: no call-ahead for whitelisted systems?

Removal...........: milters-request@milter.info?subject=remove
More information..: http://www.milter.info/#Support
--------------------------------------------------------

Hi,

on whitelisted systems milter-sender skips call-ahead. Why?

Here you can see that this really happens:

----------------------------------------------------------------------

eden{wib} telnet miraculix 25
Trying 134.245.248.198...
Connected to miraculix.informatik.uni-kiel.de.
Escape character is '^]'.
220 miraculix.informatik.uni-kiel.de ESMTP Sendmail 8.13.1/8.13.1; Thu, 11 Nov 2004
08:09:44 +0100 (MET)
EHLO eden.cs.uni-kiel.de
250-miraculix.informatik.uni-kiel.de Hello
IDENT:C8Tkb9LrITsuOQM7K0t/XugyM3e6Gj30@eden.cs.uni-kiel.de [134.245.252.9], pleased to
meet you

[...]

MAIL FROM:<>
250 2.1.0 <>... Sender ok
RCPT TO:<ttttt@informatik.uni-kiel.de> 
250 2.1.5 <ttttt@informatik.uni-kiel.de>... Recipient ok

----------------------------------------------------------------------

wib@freebsd.first.fraunhofer.de[31] telnet miraculix.informatik.uni-kiel.de. 25
Trying 134.245.248.198...
Connected to miraculix.informatik.uni-kiel.de.
Escape character is '^]'.
220 miraculix.informatik.uni-kiel.de ESMTP Sendmail 8.13.1/8.13.1; Thu, 11 Nov 2004
08:11:04 +0100 (MET)
EHLO freebsd.first.fraunhofer.de
250-miraculix.informatik.uni-kiel.de Hello freebsd.first.fraunhofer.de [194.95.172.4],
pleased to meet you

[...]

MAIL FROM:<>
250 2.1.0 <>... Sender ok
RCPT TO:<ttttt@informatik.uni-kiel.de> 
550 5.7.1 <ttttt@informatik.uni-kiel.de>... server [falbala.informatik.uni-kiel.de]
for <ttttt@informatik.uni-kiel.de> rejected address saying "550 5.1.1
<ttttt@informatik.uni-kiel.de>... User unknown"

----------------------------------------------------------------------

I think this is not a good idea. Recipients comming in this way will
be added to the cache and marked with 'ACCEPT'. After that 
milter-sender will never do a call-ahead for this address until the
entry expires from the cache.

Today I checked our milter-sender cache and found lots of invalid
local addresses marked with 'ACCEPT' :-( This gives me several
hundred MAILER-DAEMON emails every day.

Is this behaviour a bug or a misconfiguration on my side? How can
I change milter-sender to do a call-ahead for every connection?

Thanks

Willi




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