Sendy

Sendy is a self-hosted email newsletter platform that uses Amazon SES for delivery, meaning your sending costs scale with actual sends rather than subscriber counts. The $69 one-time purchase is extraordinarily cheap compared to traditional SaaS platforms, and you get unlimited brands, mailing lists, and subscriber accounts from that single installation. You host it yourself on your server, handle the maintenance, and pay only for Amazon's send costs, which are typically fractions of a cent per email.

This appeals to cost-conscious agencies with technical staff who are comfortable managing server infrastructure and want the absolute lowest cost per send. The Amazon SES requirement means you'll need to handle deliverability reputation yourself, warm up sending IPs if you get dedicated ones, and monitor bounce rates rather than having a platform handle it. For high-volume agencies or those serving price-sensitive clients, the math works out dramatically cheaper than SaaS alternatives, but the tradeoff is more hands-on ops and deliverability management.