social/mass_mailing_custom_unsubscribe/views/mail_unsubscription_view.xml

<?xml version="1.0" encoding="utf-8" ?>
<!-- Copyright 2016 Jairo Llopis <jairo.llopis@tecnativa.com>
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->
<odoo>

<record id="mail_unsubscription_view_form" model="ir.ui.view">
    <field name="name">Mail Unsubscription Form</field>
    <field name="model">mail.unsubscription</field>
    <field name="arch" type="xml">
        <form>
            <sheet>
                <group>
                    <field name="date" />
                    <field name="mass_mailing_id" />
                    <field name="unsubscriber_id" />
                    <field name="mailing_list_ids" widget="many2many_tags" />
                    <field name="email" />
                    <field name="action" />
                    <field
                            name="reason_id"
                            attrs="{'required': [('action', '=', 'unsubscription')]}"
                        />
                    <field
                            name="details"
                            attrs="{'required': [('details_required', '=', True)]}"
                        />
                    <field name="details_required" invisible="True" />
                    <field name="metadata" />
                </group>
            </sheet>
            <div class="oe_chatter">
                <field
                        name="message_follower_ids"
                        widget="mail_followers"
                        groups="base.group_user"
                    />
                <field name="message_ids" widget="mail_thread" />
           </div>
        </form>
    </field>
</record>

<record id="mail_unsubscription_view_tree" model="ir.ui.view">
    <field name="name">Mail Unsubscription Tree</field>
    <field name="model">mail.unsubscription</field>
    <field name="arch" type="xml">
        <tree decoration-warning="action in ['unsubscription', 'blacklist_add']">
            <field name="date" />
            <field name="mass_mailing_id" />
            <field name="unsubscriber_id" />
            <field name="mailing_list_ids" widget="many2many_tags" />
            <field name="email" invisible="True" />
            <field name="action" />
            <field name="reason_id" />
            <field name="details" invisible="True" />
        </tree>
    </field>
</record>

<record id="mail_unsubscription_view_search" model="ir.ui.view">
    <field name="name">Mail Unsubscription Search</field>
    <field name="model">mail.unsubscription</field>
    <field name="arch" type="xml">
        <search>
            <field name="mass_mailing_id" />
            <field name="unsubscriber_id" />
            <field name="mailing_list_ids" />
            <field name="email" />
            <field name="reason_id" />
            <field name="details" />
            <separator />
            <group string="Group by">
                <filter
                        name="group_by_month"
                        string="Month"
                        context="{'group_by': 'date:month'}"
                    />
                <filter
                        name="group_by_year"
                        string="Year"
                        context="{'group_by': 'date:year'}"
                    />
                <filter
                        name="group_by_action"
                        string="Action"
                        context="{'group_by': 'action'}"
                    />
                <filter
                        name="group_by_email"
                        string="Email"
                        context="{'group_by': 'email'}"
                    />
                <filter
                        name="group_by_reason"
                        string="Reason"
                        context="{'group_by': 'reason_id'}"
                    />
                <filter
                        name="group_by_mass_mailing"
                        string="Mass mailing"
                        context="{'group_by': 'mass_mailing_id'}"
                    />
            </group>
        </search>
    </field>
</record>

<record model="ir.ui.view" id="mail_unsubscription_view_pivot">
    <field name="name">Mail Unsubscription Pivot</field>
    <field name="model">mail.unsubscription</field>
    <field name="arch" type="xml">
        <pivot string="(Un)subscriptions">
            <field name="reason_id" type="row" />
            <field name="mailing_list_ids" type="row" />
            <field name="action" type="col" />
        </pivot>
    </field>
</record>

<record model="ir.ui.view" id="mail_unsubscription_view_graph">
    <field name="name">Mail Unsubscription Graph</field>
    <field name="model">mail.unsubscription</field>
    <field name="arch" type="xml">
        <graph string="(Un)subscriptions">
            <field name="date" type="row" />
            <field name="action" type="col" />
        </graph>
    </field>
</record>

<act_window
        id="mail_unsubscription_action"
        name="(Un)subscriptions"
        view_mode="tree,form,pivot,graph"
        res_model="mail.unsubscription"
    />

<menuitem
        id="mail_unsubscription_menu"
        parent="mass_mailing.mass_mailing_menu_root"
        action="mail_unsubscription_action"
    />

</odoo>