diff --git a/checkouts.cfg b/checkouts.cfg
index f0dc15b..d20809a 100644
--- a/checkouts.cfg
+++ b/checkouts.cfg
@@ -5,5 +5,6 @@ extends =
 always-checkout = force
 auto-checkout +=
     collective.dms.basecontent
+    collective.dms.mailcontent
     plone.app.dexterity
     plone.dexterity