In Mission Pillars, Lists, are mass e-mailings. Lists are great because they allow you to choose who you want to email based on tags. 

To create a list:

1. Locate "Lists" on the left-menu inside your Mission Pillars account.

2. Create a new List.

3. Fill in the required fields, add your email message, and choose the tags you wish to send this email to.

Click on "All Tags" to see a list of autogenerated tags which would include groups, form submissions, campaigns, etc. 

4. Save Your List.

5. Go back to your "Lists" and choose to view the contacts in the list or send a mass email to the contacts in this list.