Re: intermittent DNS lookup failure in combination with reject_unknown_client_hostname
- IMAP List Administration:
> Summary:Obviously, the above attempts all share the same problem, i.e. the
> - upgraded OS
> - upgraded Postfix
> - cut local named out of system
> but no change. Anyone have a suggestion as to how to pursue this problem?
problem is your network or something beyond your network.
Try running nsping (name server ping) over a long stretch of time
(e.g., 24 hours). It will tell you about dropped queries a variations
in response times.