I can no longer recommend ActiveCampaign.
Their steep decline in customer support, complete disregard for long-term customers, and outright theft of affiliate commissions make them no longer the company they once were. It’s genuinely sad; they were my first and favorite Email Marketing Service.
I’m currently moving all of my affiliates and myself off their platform, but once I’m done and have some breathing room, I’ll do a whole writeup about my reasons and what happened.
If you’re looking for simple and cheap, try Mailerlite.
If you need something fancier and have a bit more money, try ConvertKit.