Davide Libenzi wrote: > On Tue, 17 Apr 2007, CLEMENT Francis wrote: > > >> Possible it's a dns server problem >> Who does xmail response on a timeout after dns query ? Who many retries = >> ? >> And final decision on dns timeout ? A record tries ? >> I ask this because, I noticed that dns timeouts are frequent with some >> french isp especially on udp (qos ? prioritization ?), and an immediate >> retry generally get the response. >> > > A timeout (inside the DNS retry policy rule) from every domain DNS server > is treated as failure to get the MX, hence the A record is tried. > > > - Davide > > I'm probably missing something here, but falling back to the A record after timeouts would seem to be the wrong course of action. Couldn't a temporary connectivity issue caused Xmail to incorrectly fall-back to an A record for a domain, and worse yet, cache that A record for later use?
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