PostStack
FreemiumLiveLast verified 24 Sept 2026
EU-hosted transactional and marketing email sending with templates, broadcasts and webhooks.
Example request
curl -X POST https://api.poststack.dev/emails -H "Authorization: Bearer $API_KEY" -H "Content-Type: application/json" -d '{"from":"[email protected]","to":["[email protected]"],"subject":"Welcome","html":"<h1>Welcome!</h1>"}'Free tier, in plain English
Free plan sends up to 3,000 emails a month with no credit card; paid plans start at 5 euros/month for 10,000 emails.
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.FreeEmailJSSends transactional emails from client-side JavaScript without a backend server.FreemiumImprovMXManages email forwarding aliases and SMTP sending credentials for a custom domain.Freemium