diff --git a/postfix/conf/sqlite-transport.cf b/postfix/conf/sqlite-transport.cf
index 2f9de981..6295523b 100644
--- a/postfix/conf/sqlite-transport.cf
+++ b/postfix/conf/sqlite-transport.cf
@@ -1,3 +1,3 @@
 dbpath = /data/main.db
 query =
-  SELECT 'smtp:'||smtp FROM relay WHERE name='%s'
+  SELECT 'smtp:['||smtp||']' FROM relay WHERE name='%s'