SendPulse
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SendPulse gives you 12,000 free emails monthly and handles SMS, push notifications, and email all from one dashboard. The transactional email flows through both SMTP and REST API, and you can trigger sends based on user behavior. Their free tier is generous for small projects.
Good for startups that might later grow into omnichannel marketing. SendPulse works well if you anticipate needing SMS or push notifications alongside email, or if you want to experiment with marketing automation while keeping transactional sends in the same place.