Well, I guess I was right when I suggested that a separate document to pass along our accumulated wisdom would be a good idea.
Easier to remember straw man: 220 server EHLO foo 250 whatever MAIL FROM:<s> that's the Sender 250 ok RCPT TO:<a> that's an Acceptable recipient 250 ok RCPT TO:<d> that's a Delayed recipient 450 try later RCPT TO:<r> that's a Rejected recipient 550 no such user DATA blah blah . 554 ugh QUIT 220 server Which, if any, of a, d, and r get retried? Why or why not? What if the 554 were a 421 or 451? In your answer, please consider RFC 2821 section 4.2.5, particularly the suggestion to requeue the message in the antepenultimate paragraph of that section. R's, John
