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On 20 Oct 2006, at 13:27, Dieter Maurer wrote:

Charlie Clark wrote at 2006-10-20 15:50 +0200:
...
There is a module for testing domains against a DNS
which is much more reliable. Regarding the rest I normally check with
the responsible MX server as negatives are usually reliable.

DNS queries can take quite a long time -- and we have seen
quite a few cases where the DNS query timed out for
perfectly valid domains.

True. That is overkill, and the potential to hang a site is there.

jens


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