E-Mailing outside users

E-Mailing outside users

How does ADSelf-Service e-mail users who are setup for automatic notification of password expiration? Our organization has many contractors who do not receive e-mail address from our internal system, and I want to know if there is a way to send these people e-mails using a field on the user in Active Directory (hopefully the e-mail field that I can have them populate in ADSSP).
 
Thanks,
Daniel L.

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