From Email Address

By default the Salesforce Email notification will have a from address of the user who started the Distribution Engine scheduler. You may want to change this e.g. to a generic noreply@companyname email address. To do this follow the steps below.

• Set up an org wide email address. Salesforce documentation on how to do that is available here.
• Go to the Distribution Engine Notification workflow rule. 
• Go to the Email Alert and click Edit.
• Change the "From email address"