From this tab, you can easily send a single e-mail to a specified recipient (not only the site users). For sending e-mails to multiple users, we recommend using the Mass e-mail interface at Site Manager (CMS Desk) -> Administration -> Users -> Mass e-mail instead.

 
More resources can be found at:

 

•Developer's Guide -> Modules -> E-mail queue -> Overview

•Developer's Guide -> Modules -> E-mail queue -> Sending mass e-mails