Greg Klanderman via Postfix-users:
> Regarding the greet wait - is that a very safe check upon which to
> reject clients?  I.e. can I set it and forget it?  Or do you see some

100% of the clients that pregreet will be in error.

Allowlisting remote domains based on their reverse DNS is pointless.
Well-behaved clients will pass postscreen tests with minimal delay
assuming that you're using capable DNS reputation services. No
organization is expected to operate spambot-like crapware to send
out legitimate messages across the Internet.

        Wietse
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