Use the Exceptions tab to specify up to 100 recipients in your organization for whom messages should not be checked by the Content Filter agent. For example, if you have a customer support e-mail alias, you may want to accept all inbound e-mail messages for that address.
* Don't filter messages sent to the following recipients In this field, type the full SMTP address of a recipient in your organization and then click Add.
To change a recipient address that you have previously added, select the address and click Edit.
To remove a recipient address that you have previously added, select the address and click Remove icon
check this for more info
http://technet.microsoft.com/en-us/library/bb124490.aspx
