Communicate, from Formigo, is a feature-rich email communication suite for your Concrete5 website. Communicate includes full 'open', 'click' and 'unsubscribe' reporting.
Important -Please note
Email marketing is a delicate area, you can't just send to anyone with this add-on. Recipients need to be registered users, who are in a 'Group' on your website. You can import your users of course, or add them manually.
This is not intended to be a buik email appiication. Misusing this add-on could get your server's IP address blacklisted.
Currently you cannot subscribe existing users automatically.
Communciate sends emails sequentially, using Concrete5's built in Mail helper.
There is no logging of sent mail, other than via Concrete5's built in logging.
Maintaining a white-listed server (for email) is a bit complex. Not all hosts are equal here. If you want reliable email delivery make sure your host is up to it or, opt to send via a specialist email service such as SendGrid.
There is more information on Formigo Communicate included in the documentation here.