Make your first AI phone call with a voice API
Place your first AI phone call with Hail’s voice API. Set a system prompt, confirm recipient consent, and read the call status.
Engineering blog: voice, email, and SMS
Tutorials and guides for developers who place phone calls and send email with an API.
Send an email with an API, then check what happened
Send a plain text email with Hail’s API and confirm recipient consent. Read delivery and bounce events to check the result.
DMARC policies explained: none, quarantine, and reject
Learn how DMARC policies handle email that fails authentication. Compare none, quarantine, and reject to choose a policy for your domain.
Sender setup guides
Read about US 10DLC registration and email domain warmup. For phone calls, read the voice API page.