Installing the Sandbox Solution

The Installation can be uploaded using the user interface in SharePoint

Download Email columns sandbox solution

Upload the Solution:

Go to Site Settings | Solutions

Select the WSP file.

Activate the Solution

Activate the solution by clicking the Activate button

The OnePlaceMail SharePoint Sandbox solution is now activated and ready for use in the site collection, and will be listed as an activated solution

The email content type will now be able to be selected when creating a new document library.