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Installing the email content type Sandbox Solution
Download the Solution
Upload the Solution:
In SharePoint, browse to Site Settings | Solutions.
Select the WSP file previously downloaded.
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.