[IMail Forum] stack connect fail tracing

[Imail Admin]

Hi,   We had a problem with the "stack connect fail" error recently.  This is, according to the archives, related to being unable to resolve the domain name for SMTP delivery of messages.  Our IMail server (running 7.15) uses our own DNS server as its primary server.  It also has listed a secondary DNS server (these are listed by IP address in the services/SMTP tab) for an upstream ISP.  I'm trying to track down why this problem is occuring, or the extent to which it is "normal".   I rebooted our DNS server, even though the event log showed no problems, and I added some new (and hopefully more responsive) additional DNS servers to the IMail/SMTP setting.  The number of connect fails has gone down from every few minutes (as it was yesterday) to once every twenty minutes or so.  My questions are:   1. Is this a reasonable number?  2. How do I trace where the IP resolution fails? 3. Does IMail use all of the DNS servers for which it is configured, or only some?   Any advice would be helpful.  We've been thinking about replacing our DNS server, but we're a pretty small operation and I'm not sure that that server is really all that busy.   Thanks,   Ben Bednarz BC Web