This is a line I usually have in my Postfix setups, which provides what you are after (informing when a mail has been blocked by a 550, etc):
notify_classes = resource,software,bounce,2bounce,delay,policy,protocol
The above line switches on notification for _everything_ to do with delivery failure
Hope this assists in clarifying what I was refering to.
it does thanks. it looks like 'policy' is more or less what I'm after. Didn't notice that before sorry, I was expecting something to do with logging whereas this seems to imply postmaster emails. I'll see how it goes, thanks.
Dave.
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