Postmap: Strange Warning

[vaio1]

# /root/ispconfig/php/php /root/ispconfig/scripts/writeconf.php


start
postmap: warning: /etc/postfix/virtusertable, line 3803: expected format: key whitespace value
sh: line 1: 11823 Terminated /etc/rc.d/init.d/proftpd restart >&/dev/null
ende

[falko]

What's in line 3803 of /etc/postfix/virtusertable?

[vaio1]

sabrinafontana@*.domain.com web1_sabrina

[falko]

I'm not sure if the asterisk (*) is a problem...