Adding MX records to

These instructions are for users who purchased their domain on and would like to change their mail records (MX) so they can send and receive mail with Fastmail.

Changing your MX records is the best option for users who have a website on their domain hosted with another service. For users who do not have a website hosted at their domain, switching nameservers is usually a better option.

This guide covers three steps to setting up your domain:

  1. Add your domain to Fastmail
  2. Edit your MX records in
  3. Signing your domain

Advanced instructions for setting up MX records can be found here.

1. Add your domain to Fastmail

We have a setup guide to help you get your domain working as quickly and easily as possible.

After you have purchased your domain from, log in to Fastmail and go to the Settings → Domains screen.

Add your domain(s) (e.g. Using the Add Domain button brings up the new domain screen. Type your domain into the text box.

If your domain has been purchased from, we will display this on the next screen. You can also choose from our list of supported registrars.

Follow the wizard to add your email addresses to Fastmail. To have the wizard provide you with steps to update your MX records by default, choose Yes when you are asked if you have a website.

Please note: The domain setup wizard can only set up aliases on legacy plans. If you are on a legacy plan, you will need to add users manually in order to create additional user accounts at your custom domain.

2. Edit your MX records in

Note: We recommend making these changes at a time that you do not expect much mail to be sent to your domain.

@ 10
@ 20

Click Add Record. When you are finished, your records should look like this:

MX records added at

You should now have two MX records, and If you have any MX records aside from these two, please delete them or you may not receive any mail.

3. Signing your domain

Your domain should now be ready to receive messages. In order to make sure your sent messages reach your recipients, there are a couple more records to add in your account.

CNAME fm1._domainkey fm1.{}
CNAME fm2._domainkey fm2.{}
CNAME fm3._domainkey fm3.{}
TXT (leave blank) v=spf1 ?all

When you are finished, your domail control panel should look like this, with your domain name written in the blanks:

Domain setup complete has further instructions for using their DNS configuration panel available here.