Is it possible to configure sendmail to restrict hosts using my SMTP server to deliver mail

 I have a host connecting with the Internet to send and receive mail, but I don't want it to send or relay mail for any other hosts (I guess I will have to pay for them),  is there any way to configure sendmail to permit only some hosts or domains to relay mails through this host. I'm now using
sendmail and Linux as a mail server. Thanks for your advice.
gumpAsked:
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bertoldCommented:
Hi gump,
Yes this is possible.
Check this URL out:
http://www.informatik.uni-kiel.de/%7Eca/email/check.html

Cheers,
Bertold
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