Setting up your domain: NS/MX

With this option, we host your DNS and automatically make sure the rest of your DNS is set up correctly. All you need to do is point your nameservers to us — we take care of the rest.

We provide a control panel for full customization of your DNS records if needed. Our nameservers are fast, reliable, and secure, and you can easily manage your DNS through our simple, but powerful, interface!

There's just three simple steps to set up your domain:

  1. Add your domain
  2. Update your NS records
  3. Add email addresses at your domain

1. Add your domain

2. Update your NS records

Note: Updating your DNS can take some time: we recommend updating it at a time you don't expect many emails.

3. Add email addresses at your domain

To set up email addresses for your custom domain, add aliases at Settings → Users & Aliases. Add as many as you need. You may also choose to add a catchall alias so any mail addressed to your domain comes to you, no matter what address is used.

Creating an alias also creates a matching account identity. This lets you send mail from your account using the email address. You can customise other settings too, such as your signature.

If you'd like to set up your account to send using one of your custom domain addresses by default:

  1. Navigate to the Settings → Sending Identities screen.
  2. Select your address in the "Compose new messages from <address> by default".


Depending on the TTL values for your previous DNS settings (if any), it may take up to a day for the changes to propagate across the internet. Normally it's a lot faster: just a matter of minutes. Messages sent to the addresses you added on the aliases screen should now arrive in your Inbox.

Optional domain set up

System email addresses

The email standard requires that the email address be a valid email address. Because of this, even if you don't set up an alias for that address, we will deliver any email sent to that address to the owner of the domain.

It's also best practice to support By default, if you don't set up your own alias for, we'll automatically direct all email sent to to our abuse handling system.

Subdomain addressing and mail routing

On the Settings → Domains screen, you can control subdomain addressing and mail routing.

The Mail: Subdomain section lets you control how Fastmail handles subdomain addressing for your domain. There are three options:

The Mail: Routing section lets you choose how mail to this domain is handled. Use: