Date: Thu, 18 Jan 2001 16:06:04 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Gregory Bond <gnb@itga.com.au> Cc: Mark.Andrews@nominum.com, Mike Tancsa <mike@sentex.net>, Christopher Schulte <christopher@schulte.org>, stable@FreeBSD.ORG Subject: Re: Weird sporadic DNS resolution problems Message-ID: <200101190006.f0J064Y87542@earth.backplane.com> References: <200101182350.KAA17112@lightning.itga.com.au>
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:> This is a *human* problem not a software problem.
:
:I don't think so. I've investigated cases where the MX record is fine, the
:name servers are all responding with AA, but sendmail still refuses to deliver
:the mail. I suspect some sort of negative caching but I can't work out where.
This is the only caching sendmail does:
# persistent host status directory
#O HostStatusDirectory=.hoststat
Sendmail also stores stores the last error in the spool file, and you
can give it the MinQueueAge option:
# minimum time in queue before retry
#O MinQueueAge=30m
To cause it to skip a failed queue file for X minutes before trying
again. This prevents a single queue file from stalling all of the
sendmail's running the queue.
That's it. Sendmail doesn't cache anything else between connection
attempts.
-Matt
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