MailFlow is a self-hosted webmail and collaboration platform that plugs into the IMAP servers you already have. Self-learning spam protection, passkey login, shared calendars, notes, delegation — and a REST API for wiring up your own AI. One binary. Zero per-mailbox fees.
A built-in scoring engine that learns from every message you mark. DNS-based checks and an adaptive filter mean the junk actually stops arriving — without sending your mail to a third-party scanner.
Log in with WebAuthn passkeys — Face ID, Touch ID, Windows Hello, or a hardware key. No passwords to phish, no 2FA codes to intercept.
More than a mailbox. Share calendars across your team with attendees, invites, and reminders. A full contacts manager with labels. And notes with version history and sharing — so meeting context lives next to the meeting.
MailFlow doesn't replace your mail infrastructure — it makes it better. Point it at the IMAP server you already run (mailcow, Dovecot, Gmail, anything speaking IMAP) and it syncs bidirectionally: mail, folders, flags, all of it.
Write now, send when it matters — schedule any message for the moment it should land, then reschedule or cancel before it goes. Organize the rest with Gmail-style labels, filters, and saved searches that run server-side.
Grant an assistant or teammate scoped access to your mailbox without handing over your credentials. Delegation is first-class, not an afterthought.
Your mail lives in your MariaDB database on your server, with built-in backups and export tooling. Moving on from MailFlow? Take everything with you — standard formats, no lock-in.
Every mailbox becomes a programmable surface. Generate an API key per user, then let the automations and AI agents you choose — your own models, your own prompts, your own rules — read calendars, query mail, and act on your behalf.
Unlike hosted suites, there's no vendor AI summarizing your correspondence by default. The only intelligence touching your mail is the intelligence you wire up yourself.
Every message your business sends lives on someone else's server. Hosted suites charge per mailbox, scan your correspondence for their benefit, and can suspend you without notice. Compliance frameworks like SOC 2 and HIPAA make you document exactly where your data resides — "a vendor's cloud" is an increasingly uncomfortable answer.
MailFlow flips the model: one server you control, one database you own, unlimited mailboxes for your team. It's the difference between renting your business's memory and owning it.
One-time license — MailFlow keeps running forever, even if you never renew. Renew for 40%/year to receive another 12 months of updates & support. Deployment, migration, and management services available separately.
The Personal tier is a real desktop app — a single binary that runs the whole MailFlow stack on your machine. No signup, no account, no limits on features.
MailFlow is deployed and supported by CTI Services, LLC. We'll set it up on your infrastructure, migrate your existing mail, and stand behind it.
hello@ctiweb.io