Thanks Bill. I did this and users are still able to use SMTP. I'm using mysql, there's any diference ?
No. Make sure that smtp-auth is failing. Next, double check that open-smtp is clear, that you don't have any relays setup in tcp.smtp, and that tcp.smtp.cdb is updated. If all that is in place, make sure the relayed messages are coming in from smtp, and not a web form or something (i.e. formmail.pl being exploited).
Regards,
Bill