Custom Domains with Fastmail
What is a domain?
A domain name is part of a person or business's online identity. Owning a domain lets you choose where you direct all your online activity, including for your website or your email.
You might know a domain as what you type into your browser when you are trying to go to a website
Fastmail’s domain, for instance, is
Anyone can own and use a domain. A custom domain allows you to receive email at any address you like (such as
@greatproduct.com), not just from Fastmail's many domains.
You can host the email for your domains with Fastmail, providing you have a Standard or Professional account.
Our account limits page lists how many domains and aliases each account type may have. Users on a Basic plan must use on of FastMail's domains.
How do I buy a domain?
Domains can be purchased through a domain registrar. A registrar is a company that manages the purchase and ownership of internet domain names. Fastmail does not sell domains, however if you’re looking for a domain registrar, we recommend iwantmyname. There are numerous domain registrars to choose from, so it’s a matter of personal preference when deciding which one you’d like to use!
How do I use a custom domain?
Now that you’ve purchased the domain name you’d like to use, you’ll need to make some changes to your DNS records so that you can send and receive mail from your domain. These changes are to be made through the control panel supplied by your registrar. This looks different for every registrar, however we have a guide for making DNS changes with Namecheap as an example. If you need further assistance, please contact your domain registrar.
There are three different ways you can use Fastmail with your custom domain.
Nameservers hosted with Fastmail
- This is the easiest, most commonly used option.
- Host your custom domain with us: we will automatically configure your domain for email support, calendar syncing, contacts syncing and other security best practices (DKIM, SPF and more).
- You will be able to manage your domain easily within your Fastmail settings. You can update your domain records if you want a website or want to use other services being hosted elsewhere.
- We can detect many common configuration errors and will alert you to any issues.
- It is not a good idea to change nameservers without preparation if you already have a website on your domain.
- Step by step instructions on adding your domain to Fastmail with NS/MX
Nameservers hosted elsewhere, but MX records pointing to Fastmail
- For users whose domain is already hosted elsewhere (and have no ability or desire to change nameserver host), but who would like to use Fastmail for mail hosting.
- Changes must be made on the control panel supplied by your domain registrar. We provide you with the values you'll need to add to your DNS records.
- Fastmail can detect some MX-related set up errors, and we'll notify you if there are issues.
- Step by step instructions on adding your domain to Fastmail with MX-only
No NS/MX at Fastmail, but mail redirected to Fastmail
- In rare cases, Fastmail isn't hosting the nameserver or the mail exchange records, but mail is still being redirected to Fastmail.
- Use this option if you're using a third party filtering service to process mail before it is sent to us.
- Fastmail's own spam filtering will be much less effective if you use this option.
- We provide all the values you'll need to configure on your current MX server to ensure correct mail delivery. Fastmail is unable to detect misconfigurations in this case, as all the domain management is held elsewhere.
- Step by step instructions on adding your domain to Fastmail with no NS/MX
Please note that only account administrators can manage custom domains on an account. If you’re not an administrator of your account but would like to use a custom domain, or are having issues with your domain, please be sure to contact your administrator.
With email, it's easy to have multiple domains that "mirror" each other. So you might have
example.com.au, and you want any email address at
example.com to work at
example.com.au as well. To set this up:
- Pick a "primary" domain (say
example.com), and create all your domain aliases and accounts in that domain.
- Create a single alias in your alternate domain with the special
*(star) value (e.g.
*@example.com.au) and set the target of that alias to
*@example.com. Then any valid email address at
example.com, will also work at
example.com.au. Note that this only works for email addresses; for websites, you have to explicitly create the website for each domain, or set up a redirect to the primary domain.