I believe what you are saying is that the RCPT TO: should be evaluated
before any other checks. I don't have any specific statistics to support
this, but I have noticed in previous work that there was a very
significant
level of email addressed to non-existent or expired customers. The RCPT
TO:
should be evaluated first,
Rejecting based upon RCPT TO alone is a significant logical hole it allows
automated address harvesters to poll an MTA with random addresses so that
it can build up a list of valid ones.
Far better to validate upon receipt of all three, and reject with no notice
of what check failed.
d.
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