diff --git a/config/filter.d/postfix.conf b/config/filter.d/postfix.conf
index 8806ee3d..b88faf7b 100644
--- a/config/filter.d/postfix.conf
+++ b/config/filter.d/postfix.conf
@@ -10,7 +10,7 @@ before = common.conf
 
 [Definition]
 
-_daemon = postfix(-\w+)?/[^/\[:]+(?:/smtp[ds])?
+_daemon = postfix(-\w+)?/[^/\[:\s]+(?:/smtp[ds])?
 _port = (?::\d+)?
 _pref = [A-Z]{4}