LumenMail on the edge.

A self-hostable webmail running entirely on Cloudflare Workers, with Prism OAuth identity, D1 storage, and native Email Routing + Email Sending.

Quick start

Deploy

Cloudflare-native

Workers + D1 + KV + R2 + Email Routing + Email Sending. No SMTP server, no IMAP server, no VM.

Prism OAuth

FluentUI

Built entirely on Fluent UI React 9 — no raw browser components, themed light + dark.

Zero-state install

First boot guides an admin through configuring OAuth and provisioning the D1 schema. After that, every request is authenticated.

What is Lumen?

Lumen is a webmail front end and Cloudflare Worker that lets a small team operate a fully working mailbox using Cloudflare's native Email Routing (for inbound mail) and Email Sending (for outbound mail). Identity is delegated to Prism so that users sign in with the same account they use for the rest of your stack.

Each Lumen user can register one or more email addresses (after configuring the matching routes in Cloudflare Email Routing), file mail into custom folders, search history, attach files, archive and trash threads — everything you would expect from a webmail.

Storage model

Backing service	Lives in
Sessions	Workers KV
App config	Workers KV
Mail metadata	D1 (SQLite)
Raw `.eml` and blobs	R2
User identity	Prism OAuth (remote)

See Quick start to bring everything online.