Sharepoint 2010 external customers cannot get e-mail

We currently have consultants doing work for us who have Active Directory only access to our domain.  With this, they can get access to documents and projects on Sharepoint.  They want to be notified when changes are made, but sharepoint says it does not know their external e-mail addresses.

What can I do to get them setup so they can receive the notifications from sharepoint?

Our environment is 1 Exchange 2010 server and the 2010 Sharepoint server.
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Neptune ITAsked:
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Zaheer IqbalTechnical Assurance & ImplementationCommented:
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Zaheer IqbalTechnical Assurance & ImplementationCommented:
Or setup relaying in your exchange enviroment

http://blog.armgasys.com/?p=164
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