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From: Robert Dalton (supportaccesswest.com)
Date: Wed Feb 06 2002 - 03:29:23 CST

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    Greetings Postfix users,

    I'm noticing a strange problem with dns_lookup.

    554 Client host rejected: cannot find your hostname, [194.38.160.236]

    Performing dig lookups at each of the name servers listed, shows
    the correct PTR record.

    dig narn.deckpoint.ch 236.160.38.194.in-addr.arpa PTR

    ;; ANSWER SECTION:
    236.160.38.194.in-addr.arpa. 86400 IN PTR fulgan.deckpoint.net.

    The ip address in question had no PTR record until *friday last week*.

    Does Postfix have a negative cache for DNS lookups?

    Anyone have ideas how to further diagnose the problem ?

    Regards,

    Robert Dalton
    AccessWest.com

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