> Even more important than diagnosis though is direct end-to-end delivery
> of mail without intermediaries wherever possible for minimal latency and
> greatest security and reliability of delivery.
as well as improving control (it sits in *your* queue, so you can process
it as you want), saves bandwidth (e.g. if the final MTA rejects the message
before the DATA stage -- particularly for "message too large"), and ensures
that if the message is rejected, the user gets the whole message (rather than
a truncated error report), allowing retransmission, etc.
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