On 17/12/15 19:24, Scott Neader wrote: > What's odd is that quite a few of the IPs listed in the log really do have > proper rDNS (including all of them in the example above). When I do an > nslookup on the same server, they all resolve fine. > > Any pointers as to what might be going on here?
My best guess is that your DNS is flaky. Can you afford to packet-capture for long enough to see one such going past? UDP _and_ TCP ports 53. -- Cheers, Jeremy -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
