Xp_sendmail error

Hello,

I am trying to use xp_sendmail to send out an email. Upon executing the procedure that contains the sendmail code i receive an error that says "xp_sendmail: Procedure expects parameter @user, which was not supplied." However after attempting to define the @user parameter an error stating "xp_sendmail: Invalid parameter '@user'" I believe the MS page tells me to leave the @user parameter off. How can i successfully and correctly send email from with a stored procedure using ms sql server 2005? Sample code attached

EXEC master.dbo.xp_sendmail 
    @recipients=N'emailaddress@anywhere.anything',
    @message=N'some text.'

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