Email infrastructure
for developers
Receive emails via SMTP, authenticate with SPF/DKIM/DMARC, and deliver to your webhooks in real-time. No complex setup required.
How your emails flow through Unbo
From reception to delivery, every step is authenticated and verified.
Email Arrives
SMTP server receives incoming mail on your custom domain
Authentication Checks
SPF, DKIM, and DMARC verification runs automatically
Email Stored
Message is persisted with full headers and metadata
Webhook Fires
Parsed payload is delivered to your endpoint in real-time
Everything you need for email ingestion
Production-ready features built for developers who need reliable email infrastructure.
Email Receiving via SMTP
Custom domain email reception with full header parsing and attachment handling.
SPF/DKIM/DMARC
Built-in email authentication checks on every incoming message.
Webhook Delivery
Real-time HTTP delivery to your endpoints with structured JSON payloads.
Domain Verification
Simple TXT record verification to prove domain ownership.
Inbox Management
Multiple inboxes per domain with independent webhook configurations.
MCP Interface
AI-native email access via OAuth2-secured Model Context Protocol.
Webhook Signing
HMAC-SHA256 payload signatures for tamper-proof delivery verification.
Webhook Replay
One-click re-delivery of failed webhooks with full request logging.
Get started in three steps
From signup to receiving your first email in minutes.
Register your domain
Add your domain and verify ownership by adding a simple DNS TXT record.
Create inboxes & configure webhooks
Set up one or more inboxes and point them to your HTTP endpoints.
Start receiving emails
Unbo authenticates every email and delivers the parsed payload to your webhook in real-time.
Built for developers
Clean JSON payloads, HMAC-SHA256 signing, and AI-native access via MCP.
Webhook Payload Structure
Every email is delivered as a structured JSON payload to your endpoint, signed with HMAC-SHA256 for security.
{
"from": "sender@example.com",
"to": ["inbox@yourdomain.com"],
"subject": "New order received",
"text_body": "...",
"html_body": "...",
"spf": "pass",
"dkim": "pass",
"dmarc": "pass"
}HMAC-SHA256 Signing
Every webhook delivery includes a signature header so you can verify payloads are authentic and untampered.
MCP Interface
Access emails programmatically through the Model Context Protocol with OAuth2 authentication for AI agents.
Webhook Replay
Failed deliveries can be replayed with a single click. Full request/response logging for debugging.
Free while we're in Beta
Unbo is in active development. During the Beta phase there's no charge — use every feature for free while we build toward general availability.
Beta Access
No credit card, no commitment. We'll give you plenty of notice before any paid plans launch.
- All features unlocked during Beta
- Custom domains & unlimited inboxes
- Webhook delivery with signing & replay
- MCP interface for AI agents
Start receiving emails in minutes
Set up your domain, create an inbox, and start receiving authenticated emails delivered to your webhook.
Create Free Account