Simon Woodward said:
Since implementing SPF on our mail servers (Qmail with Christophe
Saout's patch) we have noticed a small problem with certain domain
names.
We have noted that some (albeit rare) domain names appear to be
served
by DNS servers that instead of sending back a "No Answer" for a lack
of
TXT records, they are actually timing out. Further investigation
(checking A / MX records etc) show that there is a "working" name
server
serving out data for these domains that is perfectly capable of
returning answers to (A|MX etc) queries, however they just time out
on a
TXT query.
Has anyone else seen / experienced this ?
Anyone got any ideas what kind of name server times out on a TXT
query
instead of returning a "no answer".
I haven't seen anything like this, but then I'm testing on a
non-production box that services low volume.