diff --git a/src/add-ons/mail_daemon/system_filters/inbox/filter.cpp b/src/add-ons/mail_daemon/system_filters/inbox/filter.cpp
index c30b371c3f..9a9c96e47b 100644
--- a/src/add-ons/mail_daemon/system_filters/inbox/filter.cpp
+++ b/src/add-ons/mail_daemon/system_filters/inbox/filter.cpp
@@ -46,6 +46,7 @@ static const mail_header_field gDefaultFields[] =
 	{ "From",         	B_MAIL_ATTR_FROM,		B_STRING_TYPE },
 	{ "Cc",				B_MAIL_ATTR_CC,			B_STRING_TYPE },
 	{ "Date",         	B_MAIL_ATTR_WHEN,		B_TIME_TYPE   },
+	{ "Delivery-Date",	B_MAIL_ATTR_WHEN,		B_TIME_TYPE   },
 	{ "Reply-To",     	B_MAIL_ATTR_REPLY,		B_STRING_TYPE },
 	{ "Subject",      	B_MAIL_ATTR_SUBJECT,	B_STRING_TYPE },
 	{ "X-Priority",		B_MAIL_ATTR_PRIORITY,	B_STRING_TYPE },	// Priorities with prefered