Mailtrap
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Transactional and bulk email sending API with a built-in sandbox for safely testing emails.
Example request
curl -X POST 'https://send.api.mailtrap.io/api/send' -H 'Api-Token: $API_KEY' -H 'Content-Type: application/json' -d '{"from": {"email": "hello@example.com"}, "to": [{"email": "user@example.com"}], "subject": "Test Email", "text": "This is a test email"}'Free tier, in plain English
Free plan sends up to 150 emails a day (4,000/month cap); paid plans start around $15/month for higher volume.
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