I have found recently that my server is open to relays from outside (NT 4 IIS).<BR><BR>This means that malicious users can use my server to send spam.<BR><BR>I say my server, really it&#039;s the server I inherited here at my current job.<BR><BR>I have searched here and at microsoft.com but have not found the correct configuration settings which will allow programs like JMail (on the same server) to send messages via smtp, but will not allow any outside users to do the same.<BR><BR>Any tips?