SMTPfast
FreemiumLiveLast verified 24 Sept 2026
Sends transactional email and manages contacts, segments and broadcast campaigns via a REST API.
Example request
curl -X POST 'https://smtpfa.st/api/v1/emails' -H 'Authorization: Bearer $API_KEY' -H 'Content-Type: application/json' -d '{"from":"[email protected]","to":["[email protected]"],"subject":"Welcome!","html":"<h1>Hello!</h1>"}'Free tier, in plain English
The free plan sends up to 3,000 emails a month, described by the provider as for testing and side projects; paid plans start at $9/month for 10,000 emails.
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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.FreeEmailJSSends transactional emails from client-side JavaScript without a backend server.FreemiumImprovMXManages email forwarding aliases and SMTP sending credentials for a custom domain.Freemium