I have used Mailtrain and it's a simple alternative to Mailchimp (that I also use at work). I want to recommend Sendy, though, that costs around $60 for a one-t

I have used Mailtrain and it's a simple alternative to Mailchimp (that I also use at work). I want to recommend Sendy, though, that costs around $60 for a one-time license and uses AWS SES for sending out mail. I bought it recently and am quite happy with it. Support indie developers!