With this plugin, you can send anything a multitude of users with their emails in the second column.

I used this to send out grades to my students.

Tables would be structured the following way:

Name Email Grade for This Project Grade for the class
Jorge jorge.silva@thejsj.com
Jorge jorge.silva@gmail.com
Jorge jorge@hotmail.com

I would then upload my CSV and it would tell me if it send out the emails or not.

Pretty useful. Maybe not.