Sheesh! The problem did end up being DNS related, only on the lookup side.
My ISP distributed config lists with a typo for the primary DNS resolver IP.
All the Macs that had that (non)server as first lookup were timing out.
Which leads me to my next question... The second DNS entry in the TCP/IP
control panels of these machines was a good resolver address. Why would that
second entry not be tried? The machines in question are running System 7.5.5
with OpenTransport 1.1.2
Thanks for the help, it was instrumental in tracing the problem!
Regards;
Jeff
on 8/14/01 8:19 PM, Bill Cole wisely articulated:
> If you know that legitimate mail was rejected, you probably want to
> look closer at what happened. If, as it appears, you are only logging
> at level 3, you can't tell from your logs. From your description, it
> sounds possible that you had some sort of DNS failure, and that seems
> to me consistent with the -3162 errors. When you lose access to DNS
> service and SIMS is verifying return-paths, it will give a transient
> rejection to all incoming mail because it cannot find any names.
> Thankfully, SIMS only returns a permanent rejection response when it
> gets an actual answer from DNS that there is no such domain.
On 8/15/01 3:45 AM, Terry Allen wisely articulated:
> I can't be sure that this problem is the same, but when a friend
> got their server & connections all hooked up a couple of years back, the
> inbound routing was stuffed up by the ISP, who didn't route traffic
> properly back into the connection, only the outbound was routed correctly.
> It sounds as though something has been changed in the routing from
> your ISP & I'd check with them before looking too hard at your own servers,
> especially if it's more than a couple of machines.
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