diff --git a/src/add-ons/mail_daemon/inbound_filters/spam_filter/SpamFilter.rdef b/src/add-ons/mail_daemon/inbound_filters/spam_filter/SpamFilter.rdef
new file mode 100644
index 0000000000..a772efd786
--- /dev/null
+++ b/src/add-ons/mail_daemon/inbound_filters/spam_filter/SpamFilter.rdef
@@ -0,0 +1,15 @@
+/*
+ * SpamFilter.rdef
+ */
+
+resource app_signature "application/x-vnd.Haiku-SpamFilter";
+
+resource app_version {
+	major  = 1,
+	middle = 0,
+	minor  = 0,
+	variety = 0,
+	internal = 0,
+	short_info = "1.0.0",
+	long_info = "Haiku SpamFilter mail_daemon add-on."
+};