ADD mail_show_follower copied from https://github.com/sygel-technology/sy-server-backend/tree/12.0/mail_show_follower

mail_show_follower/README.rst

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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+	:target: http://www.gnu.org/licenses/agpl
+	:alt: License: AGPL-3
+
+==================
+Mail Show Follower
+==================
+
+This module extends the functionality of mailing to show the document followers in head of the mails.
+In the cc, only appear when:
+
+#. The followers only count if are contacts or external users (Inner Followers will be discriminated)
+#. The number of followers are more than 1.
+
+
+Installation
+============
+
+To install this module, you need to:
+
+#. Only install.
+
+
+Configuration
+=============
+
+To configure this module, you need to:
+
+#. Go General settings/Discuss/Show Internal Users CC and set if want to show or not internal users in cc details.
+#. Go Settings/Users & Company salect any user in 'Preferences' check or not the 'Show in CC' field if this user need to appear in the cc note.
+
+
+Usage
+=====
+
+To use this module, you need to:
+
+#. Send an email from any document of odoo.
+
+
+ROADMAP
+=======
+
+
+* ...
+
+
+Bug Tracker
+===========
+
+Bugs and errors are managed in `issues of GitHub <https://github.com/sygel-technology/sy-server-backend/issues>`_.
+In case of problems, please check if your problem has already been
+reported. If you are the first to discover it, help us solving it by indicating
+a detailed description `here <https://github.com/sygel-technology/sy-server-backend/issues/new>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+
+Credits
+=======
+
+Authors
+~~~~~~~
+
+* Sygel, Odoo Community Association (OCA)
+
+
+Contributors
+~~~~~~~~~~~~
+
+* Valentin Vinagre <valentin.vinagre@sygel.es>
+
+
+Maintainer
+~~~~~~~~~~
+
+This module is maintained by Sygel.
+
+
+This module is part of the `Sygel/sy-server-backend <https://github.com/sygel-technology/sy-server-backend>`_.
+
+To contribute to this module, please visit https://github.com/sygel-technology.

mail_show_follower/__init__.py

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+# Copyright 2020 Valentin Vinagre <valentin.vinagre@sygel.es>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from . import models

mail_show_follower/__manifest__.py

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+# Copyright 2020 Valentin Vinagre <valentin.vinagre@sygel.es>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+{
+    "name": "Mail Show Follower",
+    "summary": "Show CC document followers in mails.",
+    "version": "12.0.1.0.0",
+    "category": "Mail",
+    "website": "https://www.sygel.es",
+    "author": "Sygel, Odoo Community Association (OCA)",
+    "license": "AGPL-3",
+    "application": False,
+    "installable": True,
+    "depends": [
+        "base",
+        "mail"
+    ],
+    "data": [
+        "views/res_config_settings.xml",
+        "views/res_users.xml"
+    ],
+}

mail_show_follower/models/__init__.py

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+# Copyright 2020 Valentin Vinagre <valentin.vinagre@sygel.es>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from . import mail_mail
+from . import res_company
+from . import res_config_settings
+from . import res_users

mail_show_follower/models/mail_mail.py

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+# Copyright 2020 Valentin Vinagre <valentin.vinagre@sygel.es>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import models, api
+
+
+class MailMail(models.Model):
+    _inherit = "mail.mail"
+
+    @api.multi
+    def _send(self, auto_commit=False, raise_exception=False, smtp_session=None):
+        plain_text = '<div summary="o_mail_notification" style="padding: 0px; font-size: 10px;"><b>CC</b>: %s<hr style="background-color:rgb(204,204,204);border:medium none;clear:both;display:block;font-size:0px;min-height:1px;line-height:0; margin:4px 0 12px 0;"></div>'
+        group_portal = self.env.ref('base.group_portal')
+        for mail_id in self.ids:
+            mail = self.browse(mail_id)
+            # if the email has a model, id and it belongs to the portal group
+            if mail.model and mail.res_id and group_portal:
+                obj = self.env[mail.model].browse(mail.res_id)
+                # those partners are obtained, who do not have a user and
+                # if they do it must be a portal, we exclude internal
+                # users of the system.
+                if hasattr(obj, "message_follower_ids"):
+                    partners_obj = obj.message_follower_ids.mapped('partner_id')
+                    # internal partners
+                    user_partner_ids = self.env['res.users'].search([
+                        ('active', 'in', (True, False)),
+                        ('show_in_cc', '=', False),
+                    ]).filtered(lambda x: not group_portal in x.groups_id).mapped('partner_id').ids
+                    partners_len = len(partners_obj.filtered(
+                        lambda x: x.id not in user_partner_ids and (not x.user_ids or group_portal in x.user_ids.groups_id)
+                        ))
+                    if partners_len > 1:
+                        # get partners
+                        partners = None
+                        cc_internal = True
+                        # else get company in object
+                        if hasattr(obj, "company_id") and obj.company_id:
+                            cc_internal = obj.company_id.show_internal_users_cc
+                        # get company in user
+                        elif mail.env and mail.env.user and mail.env.user.company_id:
+                            cc_internal = self.env.user.company_id.show_internal_users_cc
+                        if cc_internal:
+                            partners = partners_obj.filtered(
+                                lambda x: x.id not in user_partner_ids and (not x.user_ids or x.user_ids.show_in_cc)
+                            )
+                        else:
+                            partners = partners_obj.filtered(
+                                lambda x: x.id not in user_partner_ids and (not x.user_ids or group_portal in x.user_ids.groups_id)
+                            )
+                        # get names and emails
+                        final_cc = None
+                        mails = ""
+                        for p in partners:
+                            mails += "%s &lt;%s&gt;, " % (p.name, p.email)
+                        # join texts
+                        final_cc = plain_text % (mails[:-2])
+                        # it is saved in the body_html field so that it does
+                        # not appear in the odoo log
+                        mail.body_html = final_cc + mail.body_html
+        return super(MailMail, self)._send(auto_commit=auto_commit, raise_exception=raise_exception, smtp_session=smtp_session)

mail_show_follower/models/res_company.py

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+# Copyright 2020 Valentin Vinagre <valentin.vinagre@sygel.es>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import models, fields
+
+
+class ResCompany(models.Model):
+    _inherit = "res.company"
+
+    show_internal_users_cc = fields.Boolean(
+        string='Show Internal Users CC',
+        default=True
+    )

mail_show_follower/models/res_config_settings.py

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+# Copyright 2020 Valentin Vinagre <valentin.vinagre@sygel.es>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = 'res.config.settings'
+
+    show_internal_users_cc = fields.Boolean(
+        string='Show Internal Users CC',
+        related='company_id.show_internal_users_cc',
+        readonly=False
+    )

mail_show_follower/models/res_users.py

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+# Copyright 2020 Valentin Vinagre <valentin.vinagre@sygel.es>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import models, fields
+
+
+class ResUser(models.Model):
+    _inherit = "res.users"
+
+    show_in_cc = fields.Boolean(
+        string='Show in CC',
+        default=True
+    )

mail_show_follower/views/res_config_settings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="res_config_settings_view_form" model="ir.ui.view">
+        <field name="name">res.config.settings.view.form.inherit.mail.show.follower</field>
+        <field name="model">res.config.settings</field>
+        <field name="inherit_id" ref="mail.res_config_settings_view_form"/>
+        <field name="arch" type="xml">
+            <div id="emails" position="inside">
+                <div class="col-12 col-lg-6 o_setting_box">
+                    <div class="o_setting_left_pane">
+                        <field name="show_internal_users_cc"/>
+                    </div>
+                    <div class="o_setting_right_pane">
+                        <label for="show_internal_users_cc"/>
+                        <div class="text-muted" id="show_internal_users_cc">
+                            Add internal users in cc mails details
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </field>
+    </record>
+</odoo>

mail_show_follower/views/res_users.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="view_users_form_mail_show_follower" model="ir.ui.view">
+        <field name="name">view.users.form.mail.show.follower</field>
+        <field name="model">res.users</field>
+        <field name="inherit_id" ref="base.view_users_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='signature']" position="before">
+                <field name="show_in_cc"/>
+            </xpath>
+        </field>
+    </record>
+</odoo>