I used MailChimp for years, and was constantly annoyed. I come up with some non-conventional automation ideas, and MailChimp felt like trying to climb a ladder with handcuffs.
I ended up switching to ActiveCampaign, and I've been extremely happy with them. They allow a ton of control in their automation builder.
The downside is the email editing experience on AC is terrible. MailChimp on the other hand has a great email editing experience. If you just want to send a nice-looking email once in awhile, MailChimp is the clear choice. If you want sophisticated automations, I recommend ActiveCampaign.
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