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Reverse DNS problem ?
Authored by: nekura on Jun 24, '02 10:05:28AM

While working on a x86 FreeBSD server, I noticed that sendmail startup was surprisingly long. It turned out that sendmail was by default trying to find the network name for each of the IP adresses of the machine.

If no DNS reverse information was available, it seemed that sendmail had some kind of timeout, waiting for a DNS reply. This gives the log lines shown in the previous comment :

Jun 23 13:46:20 localhost sendmail[299]: gethostbyaddr(10.0.1.2) failed: 1
Jun 23 13:46:21 localhost sendmail[299]: gethostbyaddr(10.64.64.64) failed: 1

On the x86 box, I solved the problem by adding a few lines in the DNS to allow reverse name resolution on my IP addresses.
However, I don't know if the booting delay of sendmail on OS X has the same origin, and if it can be treated in the same way...



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