--- a/UPGRADE	Sat Aug 22 18:21:04 2009 +0000
+++ b/UPGRADE	Sat Aug 22 20:24:50 2009 +0000
@@ -31,6 +31,13 @@
          chgrp nogroup /usr/local/lib/dovecot/deliver
          chmod u+s,o-rwx /usr/local/lib/dovecot/deliver
 
+       * Check the master.cf from Postfix.
+         In prior setups the service dovecot was configured slightly different.
+         If you have set the command attribute 'user' to 'nobody:mail', so
+         either remove the group mail or replace it with the group nogroup.
+
+         e.g.: flags=DRhu user=nobody argv=/usr/local/lib/dovecot/deliver …
+
     * execute upgrade.sh
 
     * start Dovecot and Postfix