On 12/25/2019 8:57 PM, Keith Moore wrote:
Any spam filtering practice based on EHLO tags is inherently dubious.
Even if it happens to "work" for some site or another at some particular
time, it's not defensible as good practice in general.
There is an appealing purity to such a view. However...
Given a context that really is an arms race, criticizing an effective
anti-abuse effort as being not defensible winds up having only two
effects. One is to make anti-abuse efforts less effective and the other
is to alienate the folk whose job it is to do anti-abuse work.
It seems unlikely that either of those outcomes is defensible.
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