diff --git a/addons/mail/models/mail_mail.py b/addons/mail/models/mail_mail.py
index ffcd806c6bb..5771cca328a 100644
--- a/addons/mail/models/mail_mail.py
+++ b/addons/mail/models/mail_mail.py
@@ -84,8 +84,6 @@ class MailMail(models.Model):
     auto_delete = fields.Boolean(
         'Auto Delete',
         help="This option permanently removes any track of email after it's been sent, including from the Technical menu in the Settings, in order to preserve storage space of your Odoo database.")
-    # Unused since v16, to remove in master.
-    to_delete = fields.Boolean('To Delete', help='If set, the mail will be deleted during the next Email Queue CRON run.')
     scheduled_date = fields.Datetime('Scheduled Send Date',
         help="If set, the queue manager will send the email after the date. If not set, the email will be send as soon as possible. Unless a timezone is specified, it is considered as being in UTC timezone.")
     fetchmail_server_id = fields.Many2one('fetchmail.server', "Inbound Mail Server", readonly=True)
diff --git a/addons/mail/views/mail_mail_views.xml b/addons/mail/views/mail_mail_views.xml
index 16270994f6d..721d01606d7 100644
--- a/addons/mail/views/mail_mail_views.xml
+++ b/addons/mail/views/mail_mail_views.xml
@@ -46,7 +46,6 @@
                                     <group string="Status">
                                         <field name="auto_delete"
                                             attrs="{'invisible': [('state', '!=', 'outgoing'), ('state', '!=', 'exception')]}"/>
-                                        <field name="to_delete" invisible="1"/>
                                         <field name="is_notification"/>
                                         <field name="message_type"/>
                                         <field name="mail_server_id"/>
@@ -98,7 +97,6 @@
                     <field name="message_type" invisible="1"/>
                     <field name="state" widget="badge" decoration-muted="state in ('sent', 'cancel')"
                         decoration-info="state=='outgoing'" decoration-danger="state=='exception'"/>
-                    <field name="to_delete" invisible="1"/>
                     <button name="send" string="Send Now" type="object" icon="fa-paper-plane" states='outgoing'/>
                     <button name="mark_outgoing" string="Retry" type="object" icon="fa-repeat" states='exception,cancel'/>
                     <button name="cancel" string="Cancel Email" type="object" icon="fa-times-circle" states='outgoing'/>
diff --git a/addons/test_mail_full/tests/test_mail_performance.py b/addons/test_mail_full/tests/test_mail_performance.py
index d860a064d73..bf399406048 100644
--- a/addons/test_mail_full/tests/test_mail_performance.py
+++ b/addons/test_mail_full/tests/test_mail_performance.py
@@ -81,7 +81,7 @@ class TestMailPerformance(BaseMailPerformance):
         record_ticket = self.env['mail.test.ticket.mc'].browse(self.record_ticket.ids)
         attachments = self.env['ir.attachment'].create(self.test_attachments_vals)
 
-        with self.assertQueryCount(employee=91):  # tmf: 90
+        with self.assertQueryCount(employee=86):  # tmf: 85
             new_message = record_ticket.message_post(
                 attachment_ids=attachments.ids,
                 body='<p>Test Content</p>',