Sender

Sender is the budget-friendly workhorse of the email marketing world. It offers an incredibly attractive free plan (2,500 subscribers, 15,000 emails/month) and paid plans that undercut almost everyone on price. Despite the low cost, it doesn't skimp on core features: a visual automation builder, pop-ups, landing pages, and a decent template library are all included. It's a no-frills, reliable option for sending newsletters and basic automation.

If your primary concern is cost per subscriber and you need solid fundamentals, Sender is hard to beat.