Parameter Value: [15-character Salesforce ID of an Organization-Wide Address]
Email From ID
Specifies an Organization-Wide Address as the From identity of the email
The Organization-Wide Address is defined in Setup > Email Administration > Organization-Wide Addresses. After setting up the Org-Wide Address, edit the record to locate the Salesforce Id. It will begin with 0D2. Each Org-Wide Address may be restricted by Profile.
Note when using the EmailFromId you must enable the View Setup and Configuration permission settings in Salesforce which gives the end user visibility, but not the ability to modify the Setup Menu.
Not for use with EmailReplytoId, mutually exclusive.