SuperMailOS vs Mailflare
Fully hosted email,
not a Cloudflare app you run yourself.
Mailflare is a real, open-source inbox — but you self-host it, deploying it into your own Cloudflare account (Workers, D1 and R2). It works in the browser only: no IMAP/SMTP, no 2FA, no deliverability tooling, and sending needs a paid Cloudflare Workers plan. SuperMailOS runs the mail server, the sending IPs and the deliverability for you — you just bring a domain.
SuperMailOS is hosted business email: we run the mail server, the sending IPs and the deliverability work, so there's nothing to self-host and no server to keep alive.
Mailflare and SuperMailOS, side by side
An honest, current comparison. Where we’re unsure of a competitor detail we describe what SuperMailOS does rather than assert theirs.
| Feature | Mailflare | SuperMailOS |
|---|---|---|
| Product model | Open-source inbox you self-host in your own Cloudflare account (Workers/D1/R2 + Email Routing) | Fully hosted mailboxes — we run the mail server, you bring a domain |
| Hosting & upkeep | You deploy, update and secure the app + its Cloudflare setup | Nothing to host — we operate the server and sending IPs |
| IMAP & SMTP (mail apps) | Web only — no IMAP/SMTP (open issue) | IMAP 993 (SSL) & SMTP 465 (SSL), every plan |
| Conversation threading | Flat message list, no threads | Threaded conversations with quote folding |
| Managed deliverability | No DMARC dashboard, warm-up or IP-reputation monitoring | DKIM signing, DMARC parsed to a dashboard, warm-up, IP watch |
| Two-factor auth | Not built in | TOTP 2FA + session management |
| Sending & replying | Requires a Cloudflare Workers paid plan (~$5/mo) | Send and reply as any address, included |
| Where your mail lives | In your own Cloudflare account (D1 + R2) — full data ownership | On our managed infrastructure; export any time |
| Price | Free & open-source; Cloudflare Workers Paid ~$5/mo to send | Pro $4/mo per mailbox ($3 annual) · Business $6/mo ($5 annual) · 14-day trial |
Mailflare details compiled from public sources as of 2026-09 and may have changed since. SuperMailOS details reflect current plans.
Where Mailflare wins
Free and open-source
The app is open-source and free to run; the only hard cost is Cloudflare's ~$5/mo Workers plan to send. If your budget is near zero, that's hard to beat.
Your mail stays in your account
Everything lives in your own Cloudflare D1 and R2 — full data ownership and sovereignty, which some teams prefer on principle.
No per-mailbox fee
Because you host it, there's no per-seat pricing — you run as many mailboxes as your own Cloudflare usage allows.
Where SuperMailOS wins
Nothing to self-host
No app to deploy, patch or keep alive, and no Cloudflare Workers plan gating whether you can send. You bring a domain; we run the mail server and the sending IPs.
Works in every mail app
IMAP (993) and SMTP (465) on every plan, so Apple Mail, Outlook and the phone mail apps just work. Mailflare is web-only today.
Deliverability is operated
DKIM signing, SPF and DMARC from the mail server's own zone, DMARC reports parsed into a dashboard, new-domain warm-up and IP-reputation monitoring — none of which Mailflare provides.
Threaded inbox + 2FA
Real conversation threading, TOTP two-factor and session management — Mailflare has a flat message list and no built-in 2FA.
What you get with SuperMailOS, on every plan
We run the mail server, so the parts other tools leave to you are simply included:
Deliverability is operated, not DIY
DKIM signs every message; SPF and DMARC are published from the mail server's own zone and verified live before you can send. DMARC reports are parsed into a dashboard, sending-IP reputation and reverse DNS are watched, and new domains warm up automatically.
IMAP & SMTP on every plan
Standard IMAP (993, SSL) and SMTP (465, SSL) with per-mailbox app passwords, so Apple Mail, Outlook, Thunderbird or any client just works — the webmail is optional, not the only door.
A real threaded inbox
Conversations, instant search, labels, drafts, signatures and keyboard shortcuts — across every domain you connect, in one place. Reply as any address on any domain.
Cc and Bcc done properly
Full Cc and Bcc with privacy preserved: a Bcc line is only ever shown to the sender or a recipient who was themselves Bcc'd, and Bcc never affects threading.
Two-factor & session control
TOTP two-factor authentication and session management on your account, so a leaked password alone can't open your mail.
One-click DNS
Publish the records with one click on Cloudflare, DigitalOcean, Linode, Vultr, Hetzner or Spaceship — or copy-paste anywhere else. Provider tokens are used once and never stored.
Dark mode, everywhere
A genuine dark theme across the whole app and marketing site, tuned for contrast — not an inverted screenshot.
Which one fits you
If you want a free, open-source inbox that lives entirely on infrastructure you own, and you’re happy to deploy and maintain it on Cloudflare without IMAP/SMTP or deliverability tooling, Mailflare is a genuinely nice project. If you want hosted mailboxes across one or many domains — with IMAP/SMTP, threading, 2FA and deliverability handled for you, and nothing to operate — that’s what SuperMailOS is built for.
Questions people ask
No — that's a common mix-up with similarly named alias tools. As of 2026-09, Mailflare (mailflare.co) is a full, open-source inbox: it sends, receives and stores mail in your own Cloudflare account (D1 + R2). The difference from SuperMailOS is that you self-host Mailflare and it's web-only, whereas SuperMailOS is hosted for you with IMAP/SMTP and managed deliverability.
Related
Bring your domain. We'll carry the rest.
The first domain is live in minutes, every domain after that is a click, and aliases are free on all of them.
14 days free · no credit card · your own domain