[FIX] mail: unicode character in email cannot be parsed

Sending email to addresses containing unicode characters
cannot be parsed by python and result in a UnicodeEncodeError.

This PR catch that specific exception and output a meaningful
error message.

Decision has been taken to not trigger any error message
client-side has it would have needed modifications on some
sensitive low-level backend code.

To reproduce:
- Configure odoo so it uses an email server
- Send an invoice to a partner whoose email address contains
some unicode characters (exemple: æøåÇÀ@example.com)

opw-1892409

closes odoo/odoo#27804

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