Christ is risen! Truly he is risen!
In the past I used GNU Mailman as a mailing list solution, but it was difficult to configure and looked tacky. Recently, I set up listmonk for a church.
It runs as a binary and sets up a postgres database for you. Listmonk totally rocks and even lets you template newsletters like mailchimp and tithely. It’s wonderfully boomer-friendly and I totally recommend it!