On Fri, Jul 26, 2024, Walter Alejandro Iglesias wrote:

> I've been reading more carefully the standards.  According to rfc6532,
> headers can be sent directly in UTF-8, so I ended up discarding the

3.  Changes to Message Header Fields
...
   Also note that messages in this format require the use of the
   SMTPUTF8 extension [RFC6531] to be transferred via SMTP.

So your patches require SMTPUTF8 support by all involved MTAs?

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