MarkRelay
MarkRelay Feature Suite

Everything you need to own your email infrastructure

From multi-domain two-way webmail to developer HTTP APIs, campaign broadcasts, and programmable AI agent mailboxes — all hosted on your own Cloudflare edge.

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Multi-domain

Multi-Domain Mailboxes

Manage all your domains, brands, and mailboxes from a single self-hosted app. Unify communication with total data ownership.

No app-level domain cap: Add domains without a MarkRelay per-domain fee, subject to your Cloudflare plan and configuration.
Per-domain mailboxes: Create isolated addresses and mailboxes under each domain you own.
One console for every brand: Switch between brands and domains without juggling separate accounts.
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Two-way email

Send & Receive

It's a real mailbox, not just an outbound API. Receive, read, reply, and forward — keep every customer conversation organized in one place.

Receive & store: Inbound email lands in your mailboxes and is stored in your own account.
Reply & forward: Respond to customers and forward threads without leaving the app.
Threaded conversations: Messages are grouped into threads so context never gets lost.
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Marketing email

Broadcasts

Design newsletters and schedule targeted email campaigns with ease. Deliver every message with high inbox placement from your own domain.

No MarkRelay per-message fee: Your only ongoing infrastructure charges come from your own Cloudflare account.
Recipient lists: Import and edit up to 10,000 deduplicated recipients with custom personalization fields.
Delivery tracking: Track delivery status per recipient as the campaign sends.
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Developer API

Email API

A small, versioned HTTP API for sending, listing, reading, replying, forwarding, and transferring attachments — hosted on your deployment.

Plain HTTP, no SDK: Any language that can make an HTTP request can send email.
Send & receive: The same simple API covers outbound and reading your inbox.
Simple auth: Personal `sk-` API keys with simple Bearer authentication.
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AI agents

AI Agents

Let agents send and receive email over a clean, predictable HTTP API — ideal for automated workflows, tool use, and human-in-the-loop email.

Programmable mailbox: Agents read, send, and reply to email like any other tool call.
Machine-readable discovery: OpenAPI 3.1, interactive docs, llms.txt, and an installable agent skill ship with every deployment.
Per-agent keys: Give each agent a personal key narrowed to a domain or selected mailboxes.
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Team management

Team & Permissions

Invite teammates and control exactly which domains and mailboxes each can access. Clear roles, clean boundaries — no guesswork.

Invite your team: Bring colleagues into the app and collaborate on shared mailboxes.
Scoped access: Grant access per domain or mailbox — people see only what they should.
Admin and member boundaries: Administrators manage the deployment while members work only in granted scopes.
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100% Self-Hosted on Cloudflare Edge

Your Worker compute, D1 SQLite database, R2 storage bucket, and Email Routing bindings belong directly to your account. No per-seat subscriptions, no data lock-in.

Ready to deploy your email stack?

Choose annual access or a lifetime license, with source code available when you need full control.

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