On Thu, 07 Feb 2019 17:27:03 +0000, Paul Smith said:
How would the server know to give the two different responses to the
RCPT TO?
Or does it just always temporarily reject any messages for
'two(_at_)example(_dot_)com', just in case?
It took me a while to figure out the intent was to *defer* any RCPT TO that you
planned to actually accept, but *accept* any that may or may not be acceptable,
so it can 550 it further down the line if needed. In this case, it knows that
'user2' will accept the message, so it defers it. It doesn't know if 'user1'
will accept it, so it 250's it, gets the message, and then either 250 or 550
after DATA as needed.
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