[ADD] mail_from_force module

Allow to force the Sender / From address to a fixed email address.
This is needed for SMTP servers that enforce the Sender and From to be
the same user as the one connected to the SMTP server.

mail_from_force/__init__.py

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+# -*- coding: utf-8 -*-
+from . import models

mail_from_force/__openerp__.py

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+# -*- coding: utf-8 -*-
+{
+    'name': "Force From sender to be the Admin user",
+    'author': "Daniel Reis,Odoo Community Association (OCA)",
+    'summary': 'Force the header Sender and envelope From '
+               'to a fixed outgoing address.',
+    'description': """
+    Sends all outgoing emails from the same fixed email address.
+    The email address to use is configured in the
+    System parameter "mail.from.force".
+    This email is used in the email from, along with the
+    actual name of the user triggering the email.
+
+    For more details on why this may be needed, see:
+    https://github.com/odoo/odoo/issues/3347
+    """,
+    'category': 'Mail',
+    'version': '8.0.1.0.0',
+    'license': 'AGPL-3',
+    'depends': [
+        'mail',
+    ],
+}

mail_from_force/models/__init__.py

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+# -*- coding: utf-8 -*-
+from . import ir_mail_server

mail_from_force/models/ir_mail_server.py

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+# -*- coding: utf-8 -*-
+# © 2018 Daniel Reis
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+
+from openerp import models, SUPERUSER_ID
+
+
+class MailServer(models.Model):
+    _inherit = 'ir.mail_server'
+
+    def send_email(self, cr, uid, message, mail_server_id=None,
+                   smtp_server=None, smtp_port=None,
+                   smtp_user=None, smtp_password=None,
+                   smtp_encryption=None, smtp_debug=False,
+                   context=None):
+        from_force = self.pool['ir.config_parameter'].get_param(
+            cr, SUPERUSER_ID, 'mail.from.force', context=context)
+        if from_force:
+            message['Return-Path'] = from_force
+            message['From'] = from_force
+        return super(MailServer, self).send_email(
+            cr, uid, message, mail_server_id,
+            smtp_server, smtp_port,
+            smtp_user, smtp_password,
+            smtp_encryption, smtp_debug,
+            context=context)