Followup of odoo/odoo@c178a7829f where a failure type renaming was badly
propagated. This commit fixes failure type naming allowing to correctly
distinguish a missing email from an invalid email.
Task-2684479 (Mail: Better send error storage and display)
X-original-commit: 1a08b3f4b3aa849549783348c51c393a1f84a409
Part-of: odoo/odoo#85864