But you are already given the result of Sendmail's reverse-lookup in the
$hostname argument to filter_relay and friends, and it's in the
$RelayHostname global variable after filter_begin.

Thanks. Might be good to document that in the macros portion just for other poor saps like me who stupidly try and reinvent a wheel.

But even if you make a duplicate DNS lookup, it should be fast because
the answer is cached (you ARE running a caching DNS server, right? :-))

Of course ;-) but I don't cache nxdomain's which adds 30 seconds to the process.

Regards,
KAM
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