I help run a small commercial machines (its an old Sun IPX running Sunos
4.1.3u1 on a 64K leased line). Its running exim-1.82, although I am in
another window building exim-2.12 for it, and bind-8.1.2.
I have a really annoying intermittent problem where attempts to mail to
valid sites are rejected with:
: unknown mail domain
This will only happen a few times a day and there is no particular
pattern to the sites it rejects. If I try to lookup the same domain a
few minutes later then it is OK.
I do know that both the machine and the leased line can get pretty busy
and I was wondering if I am being hit by timeouts caused by bind not
being able to look things up fast enough.
My SMTP transport is defined as:
# This transport is used for delivering messages over SMTP connections.
smtp:
driver = smtp
and the router is defined as:
# This router routes to remote hosts over SMTP using a DNS lookup with
# default options.
lookuphost:
driver = lookuphost,
transport = smtp;
So its fairly basic stuff!!!
What I would like to do is increase the number of times the DNS lookup
is tried or the interval between retries... or anything else that will
get around this problem!!!!
I've had a quick look at spec.txt and it mentions that the dns values
are undocumented. So I was hoping that someone out there had already
figured out alternate values!!!!
Suggestions (other than buying a new machine/faster link :-) warmly
welcomed!!!
Lee
--
Lee McLoughlin. Phone: +44 171 594 8388
IC-Parc, Imperial College, Fax: +44 171 594 8432
South Kensington, London. SW7 2AZ. UK. Email: lmjm@???
--
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http://www.exim.org/ ***
