Multiple Email Disclaimers Based on Sent From Address
Using Exchange 2010 Hub Transport rules, you can configure multiple email disclaimers based on the sender's email address. This is useful if you manage an Exchange organization comprised of two or more companies, say companyabc.com and companyxyz
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Read the complete post at http://www.expta.com/2011/03/multiple-email-disclaimers-based-on.html