Hi, This is I guess more a question than a problem. Can I find out what is the max number of email smtp address allow for each domain? I know it's pretty high but was not sure. i.e. userA has it's primary address of userA but what happens if the company obtain 50 other companies. Can userA have 50 email address for each domain via the email address policy?

Not sure about 2008 AD Domains, but in 2003 AD domains, the limit was around 1300 proxy addresses per AD account, so I dont think you'll have to worry. As for recipient polcies themselves, here is an old arcticle that may still apply: http://support.microsoft.com/kb/274550/ Large Number of Recipient Policies Causes Metabase Problem Bottom line, you'll be fine with your number.

Thanks Andy.