Blue Folder Mail is a private mail app for all your custom-domain addresses. Reply from the exact address a message came to, unlock with Face ID, and keep everything encrypted with a key only you hold — on your own Cloudflare account.
Morning — the 9am loading slot just opened for Friday. If your crew wants it, say the word and I'll lock it in before the yard fills up.
Otherwise we'll keep you at 11:30 as planned.
In January 2027, Gmail ends "Send mail as" for custom domains. The addresses you've used for years stop working from the inbox you know — and most alternatives charge you per domain, every month, forever.
Blue Folder Mail takes the other path: pay once, host it yourself, and add as many domains as you like.
Everything a self-hosted inbox should be — and nothing it shouldn't. No per-domain pricing, no account on someone else's server, no key you don't hold.
Add one domain or forty, and create as many addresses on each as you want. No per-domain fee and no seat counts.
A note sent to billing@ replies from billing@. Blue Folder Mail always answers from the exact address a message arrived at.
Your mail is encrypted at rest with a key only you hold — zero-access, the way Proton does it. We couldn't read it if we wanted to.
Open with a glance or a passkey. There's no password to phish and no shared secret sitting on a server.
Add it to your home screen and Dock. It behaves like a native app, because that's the point.
Everything lives in your own Cloudflare account — about $5/month, paid by you, to them. You own the code.
Three steps from a payment to a working inbox that answers from every address you own.
Get the full source and a step-by-step install guide. One payment, yours to keep.
Follow the guide — or let us do it — to deploy Blue Folder Mail to your own account.
Add your domains, aim their mail at Blue Folder, and your inbox lights up.
Buy the software and set it up yourself, or have us install the whole thing on your Cloudflare account.
The software and a step-by-step install guide. Set it up yourself on your own Cloudflare account.
We install Blue Folder Mail on your Cloudflare account and point your domains. You just use it.
Cloudflare charges about $5/month for the services this runs on. You pay that directly to Cloudflare.
No app can promise the impossible. What we can do is tell you exactly how it's built — and show you that we don't hold a key to your mail.
Your mail is encrypted at rest with a key derived from your passkey. That key never leaves your device in a form we can use, so stored mail is unreadable to us and to Cloudflare.
You sign in with a passkey and unlock with Face ID. There's no password sitting in a database waiting to leak.
Blue Folder Mail is a self-hosted mail app for people who run their lives and work across a stack of custom domains — founders, freelancers, small teams and tinkerers who are tired of renting their inbox by the seat.
Instead of trusting a provider with your addresses and your keys, you deploy Blue Folder Mail to your own Cloudflare account. The code is yours, the encryption key is yours, and adding another domain costs nothing. It's the own-your-infrastructure approach, with the polish of an app you'd actually want to open.
One quiet inbox for every address you own, with no per-domain tax.
Encrypted at rest with a key only you hold. We can't open it.
Runs on your Cloudflare account — you keep the source for good.
Plain-English articles on owning your email, custom domains and zero-access encryption.
What's ending, when, and what to do about it.
›What it means when only you hold the key.
›From zero to a working inbox in an afternoon.
›Why a passkey is harder to phish and easier to use.
›Organize dozens of addresses without losing track.
›One-time vs per-domain, per-month pricing over time.
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