Diverting Spam before it hits the server?

I’ve got a domain that’s getting in excess of 1 million spam emails per day. None of the mail is going to any particular box. It’s all addressed to fake users so it’s being redirected to /dev/null. My provider is barking (and should be) because a lot of server resources are being used with this spam being sent to /dev/null.

My question: Is there a way to divert the spam away before it hits my domain? Keep in mind there a several users who have live email boxes on this domain.

Thanks for any help or suggestions.

 

 

 

 

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