SuperMailOS
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Changelog

What we’ve shipped.

The notable work that’s landed in SuperMailOS. Dates are when the work reached the product; smaller fixes ship continuously in between.

Inbox

Inbox: everyone on an email gets their copy, and replies thread properly

  • When an email goes to several people at your domain, each of them now gets their own copy in their own inbox.
  • Replies land in the right conversation. Threading follows the headers mail apps send, not just the subject line, and replies you send keep the full chain.
  • Bcc stays private. A Bcc line appears only on mail you sent, or on mail where you were the one blind-copied.
  • When a sending server retries a message, you see it once.
Deliverability

Sending protection that looks after your domain’s reputation

  • Attachments that can run code (programs, scripts and macro-enabled files) are blocked on the way out.
  • A brand-new sending domain ramps up gradually, paced by how long the domain has been registered.
  • Mail you send from Apple Mail or Outlook goes through the same checks as webmail.
  • If a mailbox starts drawing spam complaints, sending pauses automatically and the reason is shown in plain language.
  • The DMARC dashboard now includes the reports Google sends.
Domains

Domains go live faster, and tell you when they do

  • After you add your DNS records we keep checking in the background and email you the moment your domain is live. No more refreshing the page.
  • When a record is wrong, setup says why it fails and what to change.
  • A brief DNS hiccup never un-verifies a domain that was working.
  • One-click DNS merges into the SPF record you already have instead of adding a second one.
DevelopersAI

An API, an MCP server for your AI assistant, and reliable webhooks

  • A REST API with scoped keys you can revoke: read, search, organize and send mail from your own code. Sends are safe to retry.
  • An MCP server, so Claude Code, Cursor, VS Code and Windsurf can search, read and draft in your mailboxes. Sending is a separate permission you choose to grant.
  • Webhooks are saved before they are sent, retried for about a day if your server is down, and listed in a delivery log where you can resend any of them.
  • Documentation for all three: the API reference, webhooks, and connecting your AI.
Tools

Free email tools and a glossary

  • Eleven free checkers that need no account: email health score, deliverability, SPF, DMARC, BIMI, spoofing, blocklists, who sends email for a domain, DNS lookup, domain age and spam words.
  • A plain-English glossary of email terms, each linked to the tool that checks it.
  • The email deliverability test, where you send one real email and get a score, is opening soon.
BillingSecurity

Switch plans in place, and a published security policy

  • Change between Pro and Business, or monthly and yearly, on your existing subscription. You see the price before you confirm, and you are never billed twice.
  • A security policy explains how to report a vulnerability, what is in scope and what to expect from us.

Inbox

Inbox, wave 2 — composing and acting on mail

  • Rich-text compose, with reply and forward.
  • Bulk select to act on many threads at once.
  • Snooze and trash for keeping the inbox clear.
  • Toast notifications so every action confirms itself.
InboxDesign

Inbox, wave 1 — the foundation

  • A new design system across the whole app.
  • A rebuilt inbox data layer behind threading, search and labels.
  • Mobile navigation for the app.
  • A pass of site-wide fixes alongside the rebuild.

Site

Landing & site revamp

  • An editorial redesign of the landing page around the 'one inbox, every domain' idea.
  • A drawn value diagram in place of stock product screenshots.
  • Live, honest demos on each setup step — pick aliases, verify DNS, reply as any address.
  • A choreographed motion layer that respects prefers-reduced-motion.
  • A whole-site design-language sweep, with dark mode throughout.

Deliverability

Domains & deliverability

  • One-click DNS added Spaceship, joining Cloudflare, DigitalOcean, Linode, Vultr and Hetzner.
  • postmaster@ is auto-provisioned as an alias on every mailbox.
  • Address-collision pre-flight checks the mail server before creating an alias.
  • MTA-STS enforcement with TLS-RPT reporting on our own domain.
Content

SEO & AI-visibility content surface

  • A programmatic content surface: deliverability guides, use-case pages and comparison pages, each with its own hub.
  • llms.txt, IndexNow submission and FAQ/Product structured data so search and AI answer engines can cite accurate facts.

Come see the
current build

Start a free trial and try the current build on your own domain.

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