Zitat von Matteo Cazzador <mat...@netlite.it>:
Than'k a lot and excuse me if i'm not so clear:my local dns server , that is postfix server to, is used to filter navigation of client (by domain black list) so my local dns is under pressure and often mail give me error resolving dns while sending mail to external.I need to limitate this postfix error.
So you have a local caching-resolver on the Postfix box?If so it should not fail because of traffic as long as your system resources are not exhausted. If your system resources are exhausted using a different resolver does not help.
You might playing tricks with a local caching-resolver used by internal clients and pointing /etc/resolv.conf to some second (external) resolver but i doubt this is your problem at all.
Regards Andreas
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