[FIX] call super() method in send_get_mail_to function

mail_single_send_several_recipients/README.rst

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+Mail Single Send with Several Recipients
+========================================
+
+With this module, when there are several recipients,
+Odoo sends only one single e-mail with all the addressees instead of one email per address.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Chafique Delli (chafique.delli@akretion.com)

mail_single_send_several_recipients/__init__.py

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

mail_single_send_several_recipients/__manifest__.py

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+# -*- coding: utf-8 -*-
+{
+    'name': 'Mail Single Send with Several Recipients',
+    'version': '10.0.1.0.0',
+    'category': 'Mail',
+    'license': 'AGPL-3',
+    'summary': "When there are several recipients, always send only one e-mail for all the addressees",
+    'author': 'Akretion',
+    'website': 'http://www.akretion.com',
+    'depends': ['mail'],
+    'installable': True,
+}

mail_single_send_several_recipients/models/__init__.py

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

mail_single_send_several_recipients/models/mail_mail.py

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+# -*- coding: utf-8 -*-
+
+from odoo import models, api
+from email.utils import formataddr
+
+
+class MailMail(models.Model):
+    _inherit = 'mail.mail'
+
+    @api.multi
+    def send(self, auto_commit=False, raise_exception=False):
+        for mail in self:
+            email_to = []
+            for partner in mail.recipient_ids:
+                for partner_email in [formataddr((partner.name, partner.email))]:
+                    email_to.append(partner_email)
+            mail.email_to = email_to
+        return super(MailMail, self).send(auto_commit=auto_commit,
+                                          raise_exception=raise_exception)
+
+    @api.multi
+    def send_get_mail_to(self, partner=None):
+        super(MailMail, self).send_get_mail_to(partner=partner)
+        self.ensure_one()
+        email_to = []
+        for partner in self.recipient_ids:
+            email_to.append(formataddr((partner.name, partner.email)))
+        self.recipient_ids = [(6, 0, [])]
+        return email_to