You can choose to email specific groups or sections in your course rather than the entire class.

To email specific group or section, 

  1. In Classlist, click the View By: selector.
  2. Select Groups or Sections.
  3. Click Apply.
  4. Click the Groups/Sections selector that appears.
  5. Select the particular group or section you want to email.
  6. Click Apply.
  7. Select the checkbox above the table displaying the participants in the group/section.
  8. Click the Email link.
  9. Compose and send your email message as usual.