Your username is the email address you use to log in to your Fastmail account. You can change your username at any time, and all admin users can rename their users' accounts.
For security purposes, you cannot change a username more than twice every seven days, or more than once in 24 hours. Your username cannot be changed during your trial period.
To rename an account:
- Go to the Settings → Users & Sharing screen.
- Click the Edit button on the user you want to rename.
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Click Rename.
- Enter what you'd like your new username to be. Check your new address to make sure it's exactly what you want.
- Click Save.
Note: When you rename an account, the old username will be automatically added as an alias. This means emails can still be sent and received to and from the old address.
If you don't want to receive emails sent to the old address, you can delete the alias on the Settings → Users & Sharing screen.
Limitations: Dots and hyphens
Due to an internal technical limitation, we cannot allow dots (.) in usernames at Fastmail-owned domains. Dots are allowed in usernames at your own custom domain, and in additional aliases (even at Fastmail domains).
We also cannot allow hyphens (-) in any usernames or aliases at Fastmail-owned domains. Hyphens are allowed in aliases at your own custom domain only.