Hi,
In CRM Email Router, there are mainly two kinds of choices:
1, configure the outgoing profile with the exchange admin account > this will save work for the Email Router setup and end-user settings
2, configure the outgoing profile for each CRM user one by one > this doesn't need an exchange admin account; however in this way, you will need to create as many outgoing profiles as the CRM users.
Please refer to the official document http://technet.microsoft.com/en-us/library/hh550167.aspx
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