AI Inbx
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Wildcard domains

An email domain for every customer

Connect *.yourapp.com once. Every customer who signs up gets their own acme.yourapp.com — sending and receiving the second they exist, without anyone touching DNS.

Get startedDocumentation
*.northwind.ioConnected once
  • HHarbourlyJust now

    harbourly.northwind.io

    hello@Welcome aboard, Tom
  • RRheinbau17m ago

    rheinbau.northwind.io

    support@Re: Booking for Thursday
  • LLindmetallYesterday

    lindmetall.northwind.io

    ava@Your quote for RFQ 4471
  • WWerkhaus2 Sep

    werkhaus.northwind.io

    notifications@Your weekly summary

+ 1,248 more, each created by one API call at signup

Onboarding

Sending on day one, not day four

Asking a customer to set up DNS means waiting on whoever at their company holds the registrar login. A subdomain under your wildcard skips them: it works the moment your code creates it.

MonTueWedThu

Their own domain

harbourly.com

Thursday

Waiting on their ITDNS verifies

Under your wildcard

harbourly.northwind.io

Instantly

First email, straight after sign-up

Why platforms use it

Like yourapp.vercel.app, for email

A working default, so nobody is blocked on DNS before they have seen your product work. Their own domain is still the best place to end up — this is how they get started.

  1. 01 · Day oneacme.northwind.ioLive at sign-up

    They send and receive the minute they sign up. No domain to buy, no records to publish, no waiting on IT.

  2. 02 · Building and testingacme-staging.northwind.ioThrowaway

    Dev, staging and test accounts get real, working addresses — without anyone touching a production domain.

  3. 03 · When they're readymail.acme.comTheir own domain

    They connect their own domain for their brand and their own reputation. The subdomain got them there.

How it works

Set up once, then one call per customer

  1. 01

    Connect *.yourapp.com

    Publish a few DNS records in your own zone, one time. That is all the DNS there will ever be.

  2. 02

    Create one at sign-up

    One API call from your signup handler. It is verified the moment it exists.

  3. 03

    Send and receive

    Straight away, from any address under it. Replies arrive on your webhook.

1domains.createin your signup handler
const domain = await aiinbx.domains.create({  name: `${customer.slug}.northwind.io`,})
2emails.sendthe very next line
await aiinbx.emails.send({  from: `hello@${domain.name}`,  to: customer.email,  subject: "Your inbox is live",  text: welcome,})

Your own email is untouched

Only the subdomains route to AI Inbx. Your team keeps receiving wherever they do today.

One domain on your plan

A wildcard counts once, however many customers you give a subdomain to.

Solutions

Where it comes in

Give your product an inbox. The hard parts are already handled.

Get started