Navigate to Setup -> Manage Users -> Mass Email Users. Select an existing list view or create a new list view, select an email template, specify the delivery option and send. It is as simple as that.

Click the Contacts or Leads tab, depending on the type of recipients you want to include in your mass email. Scroll down to the Tools section, and click Mass Email Contacts. After clicking Mass Email Contacts, you enter a four-step process to set up and customize your mass email campaigns.