Hello,
If I am not Mistaken, you have created the Thread for Symantec Endpoint Protection version 11.x
To Let you know, in Symantec Endpoint Protection version 11.x, the Product does not have a Feature where you can deploy SEP via Email.
However, In Symantec Endpoint Protection version 12.0 and Symantec Endpoint Protection version 12.1 we have this Feature as you can see in the Documents provided by pete above.
Hope that information helps!!