You can bulk email different types of users for a specific task or information.
Example: you want to email all reviewers for a specific theme who have not completed their reviews yet.
Click Communication tab
Click New Communication
Use the drop down to choose Authors
Click Refine Selection to choose the parameters for who will get the email
Apply Filter
Write the email using Placeholders where necessary
Tip: Remember to complete the Text version in case recipients don't use HTML in their emails