Open source alternative to Fastmail, Google Workspace, Zoho Mail and Migadu
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Host custom-domain email on your own Cloudflare account with Mailflare, a self-hosted inbox with full send/receive, smart rules, and zero mystery servers.
Mailflare supports multiple domains in a single deployment, so a freelancer or consultant can receive mail for every client domain from one workspace without a separate service per domain. Smart rules and labels keep client conversations organized within the same inbox.
You do not manage your clients' DNS through Cloudflare. Mailflare requires Cloudflare Email Routing, so domains must be on a Cloudflare-managed nameserver.
The Team license ($249 perpetual) covers unlimited users and shared mailboxes. A small team migrating from Google Workspace avoids the $6+/user/month subscription and keeps mail data inside their own Cloudflare account rather than on Google's servers.
Your team relies on Google Calendar, Google Drive, or Google Meet tightly integrated with Gmail. Mailflare is an email inbox only and does not replace the broader Google Workspace suite.
API keys let developers send transactional mail from their own applications through Mailflare's outbound infrastructure, using the same custom domain they receive on. Webhooks and audit logs provide visibility into what the app is sending.
Your app needs advanced transactional email features like template rendering, click tracking, or delivery analytics. Mailflare's API keys cover basic sending; purpose-built transactional providers offer more.
Mail data stays in D1 and attachments in R2, both inside the user's own Cloudflare account. There are no ad profiles and no mystery servers, per the project's own positioning. The Community edition is free to self-host for personal use.
You do not have a Cloudflare account and prefer to avoid any cloud vendor dependency entirely. Mailflare is not deployable on purely self-managed hardware.
Setting up professional email for a custom domain means choosing between expensive hosted services or complex mail server infrastructure. Google Workspace, Fastmail, Zoho Mail, and similar commercial providers charge per user per month, store your mail on their servers under their data policies, and give you no control over the underlying infrastructure. For freelancers and small teams, those per-seat costs add up fast, and switching providers means migrating years of mail across systems.
The alternative, self-hosting a traditional mail server, requires managing Postfix, Dovecot, spam filtering, and TLS certificates on a dedicated server. Most people who try it find the maintenance burden too high for a tool that should just work in the background. Mailflare takes a different approach: it runs on Cloudflare's infrastructure, which you already control if you use Cloudflare for DNS, and eliminates the server management problem entirely.
Mailflare runs on Cloudflare Workers, D1, and R2, so there is no separate server to provision. Deploy with one click via the "Deploy to Cloudflare" button, then connect your domain and follow guided DNS checks for MX, SPF, and DKIM. The app name must stay "mailflare" for routing to work correctly.
Includes inbox, sent, drafts, spam, and trash folders alongside search, filters, attachments, autosaved drafts, and custom folders. New messages appear the moment they arrive via live updates. Attachments are stored securely in your own R2 bucket inside your Cloudflare account.
Create rules to route, label, forward, or archive incoming messages automatically. Rules fire on delivery, so incoming mail is sorted before it reaches your inbox. You can also block unwanted senders and set up automatic replies.
Supports separate personal, team, and client accounts with delegated access controls. Shared mailboxes give multiple team members access to the same inbox, with role-based permissions. Shared mailbox access requires the Team license ($249 perpetual).
Generate API keys from the dashboard to send transactional email from your own apps using the same Mailflare sending infrastructure. Webhooks and audit logs provide visibility into outbound activity. Outbound sending requires a Cloudflare Paid Workers plan ($5/month).
Export mailbox data manually or on a schedule for portable copies you can store anywhere. Backups cover the D1 database, making them straightforward to restore without vendor-specific tooling.
Google Workspace is the dominant commercial email provider for custom domains, at $6/user/month (Business Starter) or higher. Mailflare is an alternative for teams that want custom-domain email without a per-seat recurring subscription.
| Feature | Mailflare | Google Workspace |
|---|---|---|
| License | AGPL-3.0 | Proprietary |
| Self-hosting | Yes (Cloudflare account) | No |
| Pricing | Free (Community) / $249 Team perpetual | $6+/user/month |
| Data location | Your Cloudflare D1/R2 | Google's servers |
| Sending | Cloudflare outbound ($5/mo add-on) | Included |
Mailflare is the better choice when data ownership matters: your mail stays in your own Cloudflare account, not on Google's infrastructure. For a small team with 5 seats, Mailflare's $249 Team perpetual license costs less over two years than Google Workspace at $360/year. The real trade-off is the ecosystem: Google Workspace includes Calendar, Drive, Meet, and Docs tightly integrated with Gmail. Mailflare covers email only, so teams that depend on the full Google Workspace suite will need to supplement it with separate tools.
Fastmail positions itself as a privacy-focused commercial alternative to Gmail, starting at $3/user/month. Like Mailflare, it supports custom domains and is built for professionals. Unlike Mailflare, Fastmail is a hosted service: your mail lives on Fastmail's servers, not in infrastructure you control.
| Feature | Mailflare | Fastmail |
|---|---|---|
| License | AGPL-3.0 | Proprietary |
| Self-hosting | Yes (Cloudflare account) | No |
| Pricing | Free (Community) / $249 Team perpetual | $3+/user/month |
| Data location | Your Cloudflare D1/R2 | Fastmail's servers |
| Mobile apps | Web interface | Native iOS/Android apps |
Mailflare wins on data ownership and long-term cost for teams. Fastmail wins on polish: it has mature native mobile apps, established spam filtering, and a reputation built over two decades. Mailflare's web interface is production-ready but younger; users who prioritize a native mobile experience or battle-tested spam filtering should weigh Fastmail as a serious option.
Migadu is a small commercial provider that serves power users who want custom-domain email with minimal overhead, typically at a flat monthly rate rather than per-seat pricing. Both Migadu and Mailflare target technically savvy users who want professional custom-domain email without big-vendor infrastructure.
Mailflare's key advantage over Migadu is that your data never leaves your own account: it sits in Cloudflare D1 and R2, which you control. Migadu stores your mail on their servers under their retention policies. Mailflare also costs less for teams once the perpetual Team license is paid for. Migadu's advantage is simplicity: it works on any domain with standard DNS, with no Cloudflare dependency, and has a refined interface built over years of production use.
Deploy to your Cloudflare account with one click, or run a local development server with the following setup steps.
```bash
cp .dev.vars.example .dev.vars
npm install
npm run db:migrate:local
npm run dev
```The Community edition is AGPL-3.0 licensed and free to self-host. Receiving email costs nothing beyond your existing Cloudflare plan; sending email requires a Cloudflare Paid Workers plan ($5/month account-wide). Pro and Team licenses are available as one-time perpetual purchases for users who need custom branding or multi-user shared mailboxes.
Yes. Mailflare runs on Cloudflare Workers, D1, and R2, and uses Cloudflare Email Routing for inbound delivery. You must have a Cloudflare account and manage your domain's DNS through Cloudflare to connect it to Mailflare. There is no deployment option outside of Cloudflare.
Yes. Inbound delivery uses Cloudflare Email Routing. Outbound sending works from the inbox UI and through API keys for apps. A Cloudflare Paid Workers plan ($5/month) is required for outbound sending; receiving email works on the free Cloudflare plan.
Mailbox data lives in Cloudflare D1 (a SQLite-backed database) inside your Cloudflare account. Attachments are stored in Cloudflare R2. Neither Mailflare nor a third-party service holds your mail; it stays inside the infrastructure account you control. Manual and scheduled backups let you export portable copies of the database.
You can run Mailflare for personal use, internal team use, and internal commercial team use without restriction. What AGPL-3.0 does not allow is offering a modified version of Mailflare as a hosted managed email service to others without distributing your source changes. Running it for your own team is fully permitted.
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