It appears that Viktor Dukhovni via Postfix-users <postfix-us...@dukhovni.org> 
said:
>Only for DNS lookups. Otherwise, IIRC U-label domain names are left
>as-is, something else in your processing pipeline (a milter or
>content_filter) might replace U-labels with A-labels, but I believe
>Postfix does not.

Indeed it does not.  If you want to receive mail at EAI addresses, you need
to put both the A-label and U-label versions of the address in the alias file
or whatever since Postfix does not treat them as equivalent.

It's not a big deal but took me a little while to figure out why my tests were
getting inconsistent results.

R's,
John
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