In an effort to block all spam from firstmail.com, which is floating my mailqueue on a Debian ISPconfig server I tried this: http://madphilosopher.ca/2006/09/how-to-send-an-entire-domain-to-dev-null-in-postfix/ This didn't work. No one could receive any mail anymore on that server. Then I deleted all changes, reload Postfix but now I find this in my log: postfix/trivial-rewrite[3387]: warning: database /etc/postfix/virtusertable.db is older than source file /etc/postfix/virtusertable postfix/cleanup[3388]: warning: database /etc/postfix/virtusertable.db is older than source file /etc/postfix/virtusertable How can I fix this and what did I do wrong? thx.