Here is a comment on the web site www.dnsreport.com When you check a site on this web site the first revdns check can fail and the explanation is as follow
-------------- Reverse DNS entries for MX records This may be a false positive due to the nasty BIND bug (client side) that causes reverse DNS entries to fail the first time (if you ever see long delays in reverse DNS lookups, that's because of this bug). You can double-check using the 'Reverse DNS Lookup' tool at the DNSstuff site. ------------ I have too many timeout when cheking the first time REVDNS for non-existing revdns .
FWIW, Declude JunkMail has a technique built into it so that if BIND v8 or earlier is used locally (the ones that have the reverse DNS bug), Declude JunkMail will still receive the reverse DNS entry. So the only time that a timeout should occur in reverse DNS entry lookups in Declude JunkMail is if all the authoritative nameservers are unreachable, which should not be common.
-Scott
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