For founders with multiple products

Founders rarely have one domain. There’s the company, the side project that started as a weekend build, the micro-SaaS that pays for itself, the domain bought at 2 a.m. “just in case.” Each one accumulates email needs: a hello@ for customer questions, a billing@ for the invoices, a press@ because a newsletter asked for a contact.

The usual outcome is a junk drawer. One product on a Workspace plan, another on a cheap host’s bundled mail, a third forwarding to Gmail with SPF records from a tutorial that was wrong. Every product’s email is somewhere different, none of it is set up properly, and the bill situation is unexplainable.

SuperMailOS is built for exactly this: every product’s email, one inbox, one bill.

Ship the product, add the domain, move on

A new product shouldn’t start with a procurement exercise. With SuperMailOS, you add the domain and you’re sending from hello@newproduct.com in under five minutes: one-click DNS if the domain’s on Cloudflare or DigitalOcean, a short guided list of records to paste anywhere else. No new account, no new plan, no new bill line until there’s another human who needs a mailbox.

And because aliases are unlimited and free — you pay for people, not addresses — the standard founder setup costs one mailbox, not four. hello@, support@, billing@, press@, founders@ on every domain you own, all landing in the same inbox you already read.

Deliverability from the first send

Cold-start domains are the classic deliverability trap. A brand new domain, no sending history, SPF and DKIM missing or half-configured, and the first fifty emails to early users land in spam — the exact emails you can least afford to lose.

Every SuperMailOS domain gets the boring-but-critical work done for you: SPF, DKIM, and DMARC generated and published, IP reputation and warmup managed, and a live deliverability dashboard so you can see whether your launch email is actually landing before your users start asking. When a product takes off, its mail is already on a foundation that scales with it.

One inbox, one bill, zero tab-hopping

The inbox is Gmail-like and threaded — if you’ve used webmail this decade, you’re trained already — with IMAP and SMTP if you prefer a desktop client. All products, all domains, one view. The bill matches: one subscription, per person. Pro covers up to 3 domains at $4 per mailbox per month ($3 billed annually); Business at $6/$5 drops the domain cap entirely, for when the portfolio stops being a joke and starts being the business.

What it looks like in practice

• Weekend project goes live: domain added, hello@ working, back to building — inside five minutes.
• Product gets its first users: support@ is a free alias, not a new seat; it forwards to you until it needs a human of its own.
• One product gets acquired or sunset: remove the domain; the rest of the portfolio doesn’t notice.
• Emails actually land: the deliverability dashboard covers every domain, so the quiet one can’t fail silently.

Start with your messiest domain — the one forwarding to Gmail since 2023. The 14-day trial needs no card, and the free deliverability checker will show you what state it’s in right now. For the deeper background on the records doing the heavy lifting, read SPF, DKIM, and DMARC explained.