On Wed, Jun 05, 2024 at 11:30:27AM +0200, Slavko via mailop wrote:
> Do you want to tell, that if d= and/or s= tags contains internationalized
> domain name/label, it must be in A-label (ASCII encoded) form? Or how it is
> supposed to be handled please?
For maximal simplicity and robustness use the same encoding of domain
names (U-labels or A-labels) in "d=" and "i=" as you do (or would, if
there was "alignment") in "From:".
If the message already contains some U-labels in From, To, Cc, Reply-To,
Resent-*, ... then there's no reason to try to avoid U-labels, the
message is an SMTPUTF8 message, and so you're free to use Unicode also
in d=, and s= (though it seems a bad idea to use non-ASCII DKIM
selectors, don't do that).
--
Viktor.
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