MailOS by 14 TechnologiesSelect an email to read it
Free and open source
Business email on your domain. Free.
Mailboxes for your whole team, plus calendar, booking page and file Drive. It runs on your own Cloudflare account, so there is no per-user fee and your mail stays yours.
- 10 mailboxes free
- No card, no trial
- Phone app with notifications
- Your data, your account
Live demo
Click around. It's the real layout.
Open an email, star it, search, switch mailboxes, press Compose and Send, or pick a colour.
mail.yourcompany.com
Try a colour:
On a phone: tap ☰ for folders, tap an email to read, Back to return.
What's free
Everything a small team needs.
10Mailboxes on your domain
info@, sales@, support@, you@ and more, each with its own picture and signature.
Phone and desktop app
Install from the browser on Android or iPhone. New mail arrives as a notification.
Calendar and booking page
Events with invitations and reminders, and a public link where clients book a free slot.
Drive
1 GB per person to store and share files.
Spam filter and rules
Spam scoring, forwarding, sorting rules and instant search.
Free to run
Cloudflare receives mail free and Resend's free tier sends 3,000 emails a month.
Install free
Live in about 20 minutes.
You need a domain (like yourcompany.com) on a free Cloudflare account.
- Deploy
Click Deploy to Cloudflare and follow the prompts. Keep the Worker name
mailos. - Create your admin
Open your new app at
/setupand create the admin account. - Add your domain
Connect your domain, choose Resend's free tier for sending, and create your mailboxes.
Prefer help? 14 Technologies can set up your domain and mailboxes with you.
Need more later? Upgrading is optional.
Free covers most small teams. If you outgrow 10 mailboxes, a Pro or Team licence adds more mailboxes and logins, extra domains, more Drive space, the AI assistant and your own branding. Paste the key in Admin → Upgrade; nothing is reinstalled and your mail stays where it is.