--- a/at.deny
+++ b/at.deny
@@ -10,6 +10,8 @@
 lp
 mail
 man
+mysql
+news
 nobody
 operator
 proxy
@@ -19,6 +21,8 @@
 qmailq
 qmailr
 qmails
+squid
 sync
 sys
+uucp
 www-data