Robert Penz writes:
Ok, ignoring host entries for foreign systems is ok, but why lookup its own name?
To make that information available to local filters. Additionally, a failed lookup does not prevent mail delivery, but delays it. What probably happened is that most senders timed out before the DNS lookup itself timed out, and Courier was ready to receive mail.
Furthermore, local IP address lookup may not have been a factor anyway. If you are using the same DNS servers as recursive resolvers, if they are listed in resolv.conf, all DNS lookups will go through your recursive resolvers, including remote IP addresses and senders' domains.
And if you were using some other DNS server for recursive lookups, the first time your recursive DNS server failed to contact all of your authoritative servers, it should've cached this result, for some time, and all future queries should've probably been bounced back with an immediate SERVFAIL.
DNS is fundamental. If DNS blows up, you're dead in the water. There's no way around having functional DNS.
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