For newsletters we advise to use a dedicated newsletter service like MailChimp—sending newsletters without using a dedicated service might get you (and us) into trouble with email spam filters. In addition, newsletter services allow you to track open rates, send HTML emails, and more.
To get started with Cobot's MailChimp Add-on, see this guide For more detailed advice about targeted campaigns using the MailChimp add-on, see this guide