SMTPfast

SMTPfast provides a transactional email API with REST and SMTP interfaces for developers.

API

What your agent can do

Send one email to the supplied recipient; this creates an outbound email and has write effects.
Via API.

Tasks depend on the interface and permissions.

Choose a route that fits your agent.

For custom integrations

an API key

API connection

API path

https://smtpfa.st/api/v1/emails

Authentication: Authorization: Bearer sf_live_your_api_key
Permissions: email:send
Pricing: Free tier · Free tier; paid plans available · 3,000 emails per month. Paid plans start at $9/month for 10,000 emails; pay-as-you-go credits cost $0.001 per extra email. No credit card is required to start.