diff --git a/addons/mail/security/mail_security.xml b/addons/mail/security/mail_security.xml
index 525425c2aa0..172b233495b 100644
--- a/addons/mail/security/mail_security.xml
+++ b/addons/mail/security/mail_security.xml
@@ -8,6 +8,7 @@
             <field name="model_id" ref="model_mail_group"/>
             <!-- This rule has to be improved for employee only groups -->
             <field name="domain_force">['|', '|', ('public', '=', 'public'), ('message_follower_ids', 'in', [user.partner_id.id]), '&amp;', ('public','=','groups'), ('group_public_id','in', [g.id for g in user.groups_id])]</field>
+            <field name="perm_create" eval="False"/>
         </record>
 
         <record id="mail_followers_read_write_own" model="ir.rule">