Documentation
MailStack is an all-in-one email platform: a transactional API, deliverability tooling, and a visual template builder. These docs cover everything from sending your first email to verifying a domain and consuming event webhooks.
Quickstart
Create an API key, add a domain, and send your first email in five minutes.
Core concepts
Domains, API keys, suppression, webhooks, and templates — the building blocks of MailStack.
Sending email
Single sends, batch sends, variables, tags, and checking message status.
Domains & DKIM
Register a sending domain, publish DNS records, and verify SPF/DKIM/DMARC alignment.
Webhooks
Subscribe to delivery, bounce, complaint, open, and click events (planned).
API reference
Every endpoint with request/response JSON and cURL, Node, and .NET snippets.
Base URL & authentication
All API requests go to https://api.mailstack.voostack.com and are authenticated with
a Bearer API key. Keys are scoped and prefixed with ms_live_:
Authorization: Bearer ms_live_xxxxxxxxxxxxxxxxxxxxSee the quickstart to create your first key, or jump to the API reference for endpoint details.