Emails from "workflow@noreply" - SharePoint 2013

It was a bug in the SharePoint 2013 that workflows send emails from Workflow@noreply ... and this was actually fixed in the SharePoint 2013 March PU, the engine now will send as the outbound email address configured in the Central Administration.

Download SharePoint Updates from

http://technet.microsoft.com/en-us/sharepoint/jj891062.aspx