+
+# limit inbox to Unread and Flagged mails
+folder-hook inbox push '<limit>=(=U|=F)<enter>'
+# delete mails older than 3 months
+folder-hook inbox push '<delete-pattern>!~(~U|~F|~d<3m)<enter>'
+
+# limit youtube to Unread and Flagged mails
+folder-hook youtube push '<limit>=(=U|=F)<enter>'
+# delete other mails
+folder-hook youtube push '<delete-pattern>!~(~U|~F)<enter>'