Coming from odoo/odoo@a4597fe34f . This code is not necessary anymore since we better
handle From, SMTP-From, as well as allowing mail server filtering. We can
now use standard aliases and servers instead of relying on hardcoded value
"postmaster-odoo".
Task-2784996
closesodoo/odoo#85837
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>