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IMAP does submit intrinsically
deprecate Submit: all clients use IMAP for submission
requires IMAP have the ability to queue messages
mail queue is very complex
monitor for failures
add & delete messages
queue is simpler than full SMTP
operations to manage a single queue are same as to manage a bunch of queues
ability to generate DSNs
ability to forward to smart relay
likely implementation approach will be to bolt sendmail onto IMAP server
PPT Version