Introduction
RelayPost is a developer-first email delivery platform. It handles transactional emails (password resets, receipts, alerts) and marketing campaigns (newsletters, broadcasts) through a single API.
What you get
Section titled “What you get”- REST API — send emails, manage templates, track delivery through standard HTTP endpoints
- SMTP relay — drop-in replacement for any app that speaks SMTP
- Domain authentication — automated DKIM key generation and DNS verification
- Real-time tracking — delivery, open, bounce, and complaint events via webhooks
- Suppression management — automatic bounce handling and manual suppression lists
- Template engine — reusable email templates with variable substitution
- Campaign builder — contact lists, segments, and broadcast sends
How it works
Section titled “How it works”Your App → RelayPost API (or SMTP) → Email Queue → Delivery Engine → Recipient Inbox ↓ Webhook Events → Your App- You send an email via the API or SMTP
- RelayPost validates, queues, and delivers it
- Delivery events (delivered, bounced, opened) are sent to your webhook URL in real time
Authentication
Section titled “Authentication”RelayPost uses two authentication methods:
| Method | Use case |
|---|---|
| API Key | Programmatic access via the REST API |
| SMTP Credentials | Username/password for SMTP relay connections |
Both are scoped to your organization and managed from the dashboard.
Next steps
Section titled “Next steps”→ Quickstart — send your first email in 5 minutes