A free program for Android, by Mailchimp.

Mailchimp is the easiest, most affordable way to create, manage and send marketing emails. The best part is that you don’t need to be an expert.

Use Mailchimp for:

Send emails to your customers and prospective customers. Add personal messages, event updates, or anything else you’d like to share with them. Track opens and clicks, see who’s opening your emails, and get notifications when someone opens your email or clicks on a link. Manage all of your contacts and tags in one place. Set up different campaigns and track the results of each campaign. See what’s working and what’s not. Get recommendations on how to improve your marketing.