The problem
here is with the broken software you were using, not
with greylisting. [...]
[G]iven the number of commercial sites using said
software it's worth
being aware of the problems in adopting greylisting, in that you may
suddenly find yourself not receiving important emails [...]
Yeah. The world needs more people willing to tell the senders of such
email "_you_ lost it, by entrusting it to broken software".
But that requires senders willing to take the responsibility for their
own actions (such as, choosing software without making sure it actually
met the spec). And such people are in notably short supply these days,
especially in North America (which I realize you probably aren't).
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