diff --git a/mail_tracking/views/mail_tracking_email_view.xml b/mail_tracking/views/mail_tracking_email_view.xml
index 2ada7135f1..090a018755 100644
--- a/mail_tracking/views/mail_tracking_email_view.xml
+++ b/mail_tracking/views/mail_tracking_email_view.xml
@@ -104,7 +104,7 @@
             <field name="name" string="Subject" />
             <field name="time" string="Time" />
             <field name="date" string="Date" />
-            <filter name="sent" string="Sent" domain="[('state', 'in', ('sent',))]" />
+            <filter name="sent" string="Sent" domain="[('state', '=', 'sent')]" />
             <filter
                     name="deferred"
                     string="Deferred"