SMTPUTF8 issue 1: UTF8 use in address fields
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arnt commented
Hi,
EAI allows From:/To: etc to contain UTF8, but forbids nothing. This means that From: Grå <grå@xn--gr-zia.org>
is legal.
Please detect whether any address fields use xn--. The alternative is none, which includes messages that don't need/use EAI at all.