Where can one get a mass email program?

Well, none of the email marketing services I know are entirely free. However, there are some email marketing services that are more generous than others in terms of their free plan offering. If you have a small number of email subscribers (up to 1,000) then Sendinblue, MailChimp, and MailerLite have a free plan of up to 10,000 emails per month. Moreover, Sendinblue and MailerLite have no limit on the number of subscribers. Whereas, MailChimp has a 2000 subscriber limit.

In my personal opinion, I feel Constant Contact has one of the most liberal free plans. Their free plan includes an unlimited email to unlimited subscribers for 60 days and offers a 30-day money-back guarantee on their paid plans. So, you get a total of 90 days of unlimited emails to test out.