Purpose
=======
Now that we try to not spoof the FROM SMTP headers, we want to improve
the default mail FROM used in mailing. By default, it's the email of
the current user, but if no mail server is configured for it, we will
use the notification email instead and encapsulate the email of the
user in it.
e.g.:
Original: "Admin" < admin@odoo.com >
Final: "Admin (admin@odoo.com)" < notifications@odoo.com >
Show a warning message if the configured mail server can not be used
for the email from.
Task-2367946
odoo/odoo#61853
odoo/upgrade#1903