How to change a username

Your username is the email address you use to log in to your Fastmail account. All admin users can rename user accounts.

To rename an account:

  1. Go to the Settings → Users & Aliases screen.
  2. Type in your password at the top of the screen and click Unlock so you can make changes.
  3. Click the Edit button on the user you want to rename.
  4. Rename the user.
  5. Check your new name and domain to make sure it's exactly what you want.
  6. Remember to Save.

Note: when you rename an account, the old address will be automatically added as an alias. This means emails can still be sent and received to/from the old address.

If you don't want to receive emails sent to the old address, delete the alias on the Settings → Users & Aliases screen.

Why can't I have a dot in my username?

Due to an internal technical limitation, we cannot allow dots (.) in usernames at Fastmail domains. However, we do support dots in usernames at your own domain. We also allow them in aliases, even at Fastmail domains.