On 2020-08-30 21:55 BST, Wietse Venema wrote:
> An SMTP client in the pickup daemon? How shall the pickup daemon send
> a non-delivery notification to the sender?

It looks like we're one objection down!  Can I make it two...

The pickup daemon doesn't, the mail goes into the hold queue.  It's then
for the postmaster to check what's going on.  If the mail's from-address
is forged, which is my concern in this thread, then it's better that no
non-delivery notification is attempted.

Thank you for your attention to my question, this is more than I had
expected.
-- 
Nick

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