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diff --git a/addons/mass_mailing/wizard/mailing_list_merge.py b/addons/mass_mailing/wizard/mailing_list_merge.py
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+++ b/addons/mass_mailing/wizard/mailing_list_merge.py
@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
+
+
+class MassMailingListMerge(models.TransientModel):
+    _name = 'mailing.list.merge'
+    _description = 'Merge Mass Mailing List'
+
+    @api.model
+    def default_get(self, fields):
+        res = super(MassMailingListMerge, self).default_get(fields)
+
+        if not res.get('src_list_ids') and 'src_list_ids' in fields:
+            if self.env.context.get('active_model') != 'mailing.list':
+                raise UserError(_('You can only apply this action from Mailing Lists.'))
+            src_list_ids = self.env.context.get('active_ids')
+            res.update({
+                'src_list_ids': [(6, 0, src_list_ids)],
+            })
+        if not res.get('dest_list_id') and 'dest_list_id' in fields:
+            src_list_ids = res.get('src_list_ids') or self.env.context.get('active_ids')
+            res.update({
+                'dest_list_id': src_list_ids and src_list_ids[0] or False,
+            })
+        return res
+
+    src_list_ids = fields.Many2many('mailing.list', string='Mailing Lists')
+    dest_list_id = fields.Many2one('mailing.list', string='Destination Mailing List')
+    merge_options = fields.Selection([
+        ('new', 'Merge into a new mailing list'),
+        ('existing', 'Merge into an existing mailing list'),
+    ], 'Merge Option', required=True, default='new')
+    new_list_name = fields.Char('New Mailing List Name')
+    archive_src_lists = fields.Boolean('Archive source mailing lists', default=True)
+
+    def action_mailing_lists_merge(self):
+        if self.merge_options == 'new':
+            self.dest_list_id = self.env['mailing.list'].create({
+                'name': self.new_list_name,
+            }).id
+        self.dest_list_id.action_merge(self.src_list_ids, self.archive_src_lists)
+        return self.dest_list_id