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Date: Mon, 13 Apr 2020 17:52:34 +0200
From: Florian Weimer <>
To: Christian <>
Subject: Re: Resolver routines, Postfix DNSSEC troubles - how to check for incompatibilities?

* Christian:

> So Viktor did some digging:
> "The comment on line 25:
> is not encouraging.  It suggests that _res is unused. If so, Postfix
> DNS does not work correctly with this C library.  And not just for DANE, since Postfix is also unable to to control RES_DEFNAMES and RES_DNSRCH.

Are these changes to the RES_DEFNAMES and RES_DNSRCH flags really
necessary? Why doesn't Postfix use res_query (or perhaps res_send) as

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