You can use Groups to quickly send email. View your Contacts > Groups > Select the Group you want to Email and for the group you wish to contact, click the green 'Email Group' button.

This will start an email ready to be edited.

Alternatively in Communicate > New Email just start writing the name of your Group and your group will appear for you to select. 

Group Message Mailing is something different again and the difference should be noted. 

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