When first setting up Salesforce and sending emails your emails might be sent with the "noreply@salesforce.com on behalf of".


In Lightning Experience

 
  • Click on the gear icon | Setup Administration Email Deliverability
  • Locate the Email Security Compliance section.
  • Deselect the Enable Sender ID compliance box.
  • Click on Save.
  • The emails you send will no longer include 'noreply@salesforce.com on behalf of...' in the Sender field.