Davide Libenzi wrote: > On Tue, 17 Apr 2007, John Kielkopf wrote: > > >> 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? >> > > XMail does not cache A record attempts. Next one would still try to > re-fetch MX records. > > Still, you would think a timeout on a MX record lookup (from every domain DNS server) should also result in a time-out when looking up an A record. If you can get an A record without a timeout, then you should be able to at least get a nodata response on MX lookup. Good that Xmail does not cache the A record, but falling back to an A record after timeout on MX lookup still seems like a bad idea.
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