exchange 2007 block unautorized user from sending out email

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    elinoy
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    #162877

    a few days a go I found out that someone with a Gmail address rely email from our exchange server. as far as I know exchange 2k7 do not allow such a thing and this user or spammer should not be able to rely messages out. How can I change the setting that only my domain users will be able to send email out and no one else ?

    Thank you

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