The Incoming email planning worksheet is now available to download.
Overview
This worksheet helps you plan for incoming email in a SharePoint server farm environment. You can use a basic scenario in which you select all the default settings, or an advanced scenario, which requires additional planning.
For more information, see Plan incoming email for a SharePoint farm (http://technet.microsoft.com/en-us/library/cc263260(office.15).aspx) in the TechNet library.