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From
SubjectRe: osirusoft.com DNS BLs are broken ...
Date
Matti Aarnio <matti.aarnio@zmailer.org> writes:

>That in itself should not be any difficulty, but MANY
>filter codes in different MTAs appear to treat that as
>if there is genuine registered rejection!

>I have seen this at sendmails (up to and including lattest),
>and at Postfix! But also at several systems not willing
>to tell what they are running do exhibit this very same
>misbehaviour.

sendmail:

--- cut --
dnsbl Turns on rejection of hosts found in an DNS based rejection
list. If an argument is provided it is used as the domain
[...]
information. By default, temporary lookup failures are
ignored. This behavior can be changed by specifying a
third argument, which must be either `t' or a full error
message. See the anti-spam configuration control section for
--- cut --

_Anyone_ changing the default behaviour of "temporary lookup failure"
to reject mail should be treated with a really large clue-bat (TM).

Regards
Henning

--
Dipl.-Inf. (Univ.) Henning P. Schmiedehausen INTERMETA GmbH
hps@intermeta.de +49 9131 50 654 0 http://www.intermeta.de/

Java, perl, Solaris, Linux, xSP Consulting, Web Services
freelance consultant -- Jakarta Turbine Development -- hero for hire

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