diff --git a/addons/mail/i18n/mail.pot b/addons/mail/i18n/mail.pot
index d3302287f19..c27211981f2 100644
--- a/addons/mail/i18n/mail.pot
+++ b/addons/mail/i18n/mail.pot
@@ -4362,6 +4362,18 @@ msgstr ""
 msgid "Online"
 msgstr ""
 
+#. module: mail
+#: code:addons/mail/models/mail_message.py:0
+#, python-format
+msgid "Only administrators are allowed to export mail message"
+msgstr ""
+
+#. module: mail
+#: code:addons/mail/models/mail_message.py:0
+#, python-format
+msgid "Only administrators are allowed to use grouped read on message model"
+msgstr ""
+
 #. module: mail
 #: code:addons/mail/models/mail_channel.py:0
 #, python-format
diff --git a/addons/mail/models/mail_message.py b/addons/mail/models/mail_message.py
index a586fd2bc3b..0256079892b 100644
--- a/addons/mail/models/mail_message.py
+++ b/addons/mail/models/mail_message.py
@@ -700,6 +700,22 @@ class Message(models.Model):
                 elem._invalidate_documents()
         return super(Message, self).unlink()
 
+    @api.model
+    def _read_group_raw(self, domain, fields, groupby, offset=0, limit=None, orderby=False, lazy=True):
+        if not self.env.is_admin():
+            raise AccessError(_("Only administrators are allowed to use grouped read on message model"))
+
+        return super(Message, self)._read_group_raw(
+            domain=domain, fields=fields, groupby=groupby, offset=offset,
+            limit=limit, orderby=orderby, lazy=lazy,
+        )
+
+    def export_data(self, fields_to_export):
+        if not self.env.is_admin():
+            raise AccessError(_("Only administrators are allowed to export mail message"))
+
+        return super(Message, self).export_data(fields_to_export)
+
     # ------------------------------------------------------
     # DISCUSS API
     # ------------------------------------------------------
diff --git a/addons/website_mail_channel/controllers/main.py b/addons/website_mail_channel/controllers/main.py
index 143b6f08e37..0237ef4dc1d 100644
--- a/addons/website_mail_channel/controllers/main.py
+++ b/addons/website_mail_channel/controllers/main.py
@@ -17,7 +17,8 @@ class MailGroup(http.Controller):
 
     def _get_archives(self, group_id):
         MailMessage = request.env['mail.message']
-        groups = MailMessage._read_group_raw(
+        # use sudo to avoid side-effects due to custom ACLs
+        groups = MailMessage.sudo()._read_group_raw(
             [('model', '=', 'mail.channel'), ('res_id', '=', group_id), ('message_type', '!=', 'notification')],
             ['subject', 'date'],
             groupby=["date"], orderby="date desc")
@@ -44,7 +45,8 @@ class MailGroup(http.Controller):
 
         # compute statistics
         month_date = datetime.today() - relativedelta.relativedelta(months=1)
-        messages = request.env['mail.message'].read_group([
+        # use sudo to avoid side-effects due to custom ACLs
+        messages = request.env['mail.message'].sudo().read_group([
             ('model', '=', 'mail.channel'),
             ('date', '>=', fields.Datetime.to_string(month_date)),
             ('message_type', '!=', 'notification'),