Re: [Exim] DNS blacklist lookup timeout causes temp reject

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Συντάκτης: Philip Hazel
Ημερομηνία:  
Προς: Craig R. Hodges
Υ/ο: Exim Users Mailing List
Αντικείμενο: Re: [Exim] DNS blacklist lookup timeout causes temp reject
On Sat, 23 Mar 2002, Craig R. Hodges wrote:

> DNS black list lookups are cached by Exim, so a lookup based on the IP
> address or sender address is done at most once for any incoming

                                                 ^^^^^^^^^^^^^^^^

> connection.

^^^^^^^^^^
>
> Am I right in believing that the next time a connection is made from the
> same IP, it will re-check with the RBLs and not skip checking because the
> IP is in some cache?


The cache only lasts for the duration of the incoming connection. I
should make this clearer in the documentation. Exim relies on the
nameserver cache for optimization over multiple connections.

--
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.