IMAP List Administration:
>
> On 11/14/2012 11:06 AM, Jamie Paul Griffin wrote:
> > I've been getting client requests from this ip as well, i've put it into a
> > permenant spamd(8) blacklist.
> that's highly interesting, but:
>
> 1) the sender was legitimate
> 2) my problem is some sort of intermittent DNS lookup failure
> 3) that address is just one of many *legitimate* MTA addresses for which I
> have
> seen the DNS problem
Try debugging this with nsping (name server ping). I suspect that
your system suffers from occasional glitches with DNS lookups.
Wietse
