SuperMailOS

What it does

Professional email on your own domain — [email protected] — without running a mail server. You bring a domain. We generate every DNS record from the mail server's own zone, verify it live while you watch, run the MTA, sign every message with DKIM, and manage SPF, DMARC and IP reputation. There's a dashboard showing your mail is actually landing. Then it's just email: threads, instant search, keyboard shortcuts, labels, signatures, dark mode. IMAP/SMTP too. From $3/mailbox/mo. Aliases free.

Business email for every domain you run. All your products' mail in one inbox, unlimited free aliases, deliverability handled. Pay for people, not addresses.

Connect all your domains. Every address on them, whether you@ or support@ or hello@, lands in one inbox. Pay for people, not addresses. Add a domain and SuperMailOS asks which addresses you want on it. Every one you tap — hello@, support@, billing@ — delivers into one real inbox. The aliases are free, forever, on every plan. The DNS records come straight from the mail server's own zone, not a template. One click on Cloudflare, DigitalOcean, Linode, Vultr, Hetzner or Spaceship; copy-paste anywhere else. We verify live while you watch. Mail from every domain arrives in the same inbox: threads, instant search, keyboard shortcuts, labels, signatures. Add the next domain whenever you like. It…from supermailos.com

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  Eight years ago, I was job hunting and felt embarrassed by my Gmail address. I tried registering firstname.lastname — taken everywhere. So I thought: "I'm in IT, I'll set up my own domain with my own IMAP/SMTP. How hard could it be?" A lot went wrong. Forgotten renewals. rocky DNS mistakes. I ended migrating toward Google Workspace, but in the end it felt overkill, having a subscription there plus the whole registrar subscription, and the whole GAFAM sticker on it. Moreover, the final price was way too high for me at the time. Six months ago, someone approached me and related to that…

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  Email Validator by SidemailFeb 2026 · sidemail.io · ▲16

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