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Can we hit reality here at some point? I run Aberystwyth's mail servers. Out
of interest, I turned on logging of "helo" data yesterday morning. In the
last 23 hours it's logged 44082 messages from outside Aber. Of those, 2490
had only one component to the name given by "helo".
Forgetting any other considerations of correctness/reverse dns/whatever, if
I blocked 1 in every 18 messages coming in from outside on the basis of
invalid HELO alone, I'd be chased by a hoard of people with flaming torches.
HELO data might be a diagnostic pointer to possible spam, but that's about
all I think anyone running a medium to big site would dare to use it for in
the real world.
Alun.
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Alun Jones auj@???
Systems Support, (01970) 62 2494
Information Services,
University of Wales, Aberystwyth
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