EmailJS
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Sends transactional emails from client-side JavaScript without a backend server.
Example request
curl -s https://api.emailjs.com/api/v1.0/email/send -H "Content-Type: application/json" -d '{"service_id":"YOUR_SERVICE_ID","template_id":"YOUR_TEMPLATE_ID","user_id":"$API_KEY","template_params":{"username":"James"}}'Free tier, in plain English
Free plan sends up to 200 emails a month with 2 templates and a 50KB request-size cap.
Alternatives in Email
Atomic MailSelf-registers a real email inbox for an AI agent (PoW, no signup) and sends/receives mail via JMAP.FreeBrevoSend transactional and marketing email, SMS and WhatsApp, and manage contacts via one REST API.FreemiumEmail Spam TesterSends a test email through 42 deliverability and spam checks, then returns a scored JSON report.FreeImprovMXManages email forwarding aliases and SMTP sending credentials for a custom domain.FreemiumIndiePitcherSends transactional emails with markdown support and manages contact lists for SaaS appsFreemium