Restrict who can send mail in sendmail?

I just realized I have a mildly large security hole on my server right now. It is mostly that right now anyone who has a unix user account on my server can send mail through sendmail, and i deffinetly do NOT want that.

I am having problems finding out how to restrict who can send mail through the server.

Any help would be greatly appreciated.

Thanks!

 

 

 

 

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