On Wed, Mar 26, 2014 at 08:57:54AM -0500, deoren wrote:
> On March 21st I noticed these entries in my mail log and I'm not able to
> pinpoint the source of the trouble:
>
> warning: x.x.x.x.b.barracudacentral.org: RBL lookup error: Host or domain
> name not found. Name service error for name=x.x.x.x.b.barracudacentral.org
> type=A: Host not found, try again
Your nameserver logs from that time may shed more light on the reason,
but RBLs are sometimes unavailable due to DDoS, and routing problems can
happen due to bad BGP data, ... that was then and this is now. The
fact that it works now just means that the transient problem is gone.
> Is there anything obvious I can check?
log entries from your recursive resolver on whichever machine it
resides on (ideally local to the MTA host).
--
Viktor.
