Postmap: Strange Warning

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

Code:

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

 

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

 

Code:

sabrinafontana@*.domain.com    web1_sabrina

 

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