For SaaS companies

Every SaaS ends up with the same address map: hello@ for the humans, support@ for the tickets that arrive by mail anyway, billing@ for the finance mail that must not bounce, security@ because responsible disclosure pages need a real target, careers@ for the recruiter emails. Multiply that by every product you run, and email becomes an admin surface area nobody enjoys owning.

SuperMailOS runs that whole map as one system: real mailboxes for the people, unlimited free aliases for the roles, every product in one team inbox view, on one bill.

Roles are aliases, not seats

The role addresses — support@, billing@, hello@ — shouldn’t each cost a license, and they shouldn’t die when a person leaves. At SuperMailOS they’re aliases: unlimited, free, and pointed at whoever currently owns the function. You pay for people, not addresses. When your first support hire arrives, they get a real mailbox; support@ just starts forwarding to them instead of the founder.

One team view across every product

Two products, three, or a portfolio of experiments — every domain’s mail lands in the same Gmail-like, threaded inbox. No per-product logins, no forwarding chains that break quietly, no customer email trapped in a mailbox only an ex-employee could open. Anyone who prefers their own client gets IMAP and SMTP; anyone who lives in webmail is productive on day one because it’s familiar on purpose. When an investor emails hello@ and a churned user emails support@ in the same hour, both land next to each other, answered from the same place by whoever is on call.

New product? Add the domain — under five minutes, one-click DNS on Cloudflare or DigitalOcean, guided records elsewhere — and hello@newproduct is live. Pro covers up to 3 domains at $4 per mailbox per month ($3 billed annually); Business at $6/$5 is unlimited domains, which is the one you want once the product count grows.

The mail that must land

SaaS lives on a knife-edge of mail: password resets, billing notices, security alerts, invoice failure warnings — all of it sent from your domain, all of it catastrophic if it lands in spam. SuperMailOS generates and publishes SPF, DKIM, and DMARC for every domain you add, manages IP reputation and warmup, and gives you a live deliverability dashboard so placement is something you check, not something users report.

The same setup keeps your domain harder to spoof — the fake-“your invoice failed” phishing that borrows your domain is exactly what DMARC published properly is for.

What it looks like in practice

• Day one: hello@, support@, billing@, security@ live on the product domain before the first signup.
• First hire: one real mailbox added; every alias they inherit keeps its address.
• Second product: new domain, same inbox, same bill, five minutes.
• Incident week: the deliverability dashboard confirms status-page mail is landing while customers are still calm.

Start the 14-day trial — no card — on your product domain, and run it through the free deliverability checker first so you have a before/after. If the record side is new to you, SPF, DKIM, and DMARC explained is the background that makes the dashboard make sense.