Personally, I think the easiest solution to this problem is to modify
the
semantics of 250 after DATA such that in the case of a message with
multiple RCPT TO we shouldn't *require* that a notification be generated
for a "delivery failure" if this "failure" is an action requested by a
mailbox "owner".
If you're going to change SMTP,
I think it's better to create a new commands rather than modify old ones.
No, I don't believe so. A change such as I suggested is backward compatible
and works right away. I think. I'm not particularly attached to the idea.
In this case, I'd suggest two new commands.
Some disadvantages;
Only useful if both sender and receiver have implemented it.
Till then it's just dead code/wasted text in the specification.
You've raised the killer objection to your own idea.
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