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 → Team & 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 email address. 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, delete the address on the Settings → Team & 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 non-username email addresses (even at Fastmail domains).
We also cannot allow hyphens (-) in any usernames, or in any other email addresses at Fastmail-owned domains. Hyphens are allowed in non-username email addresses at your own custom domain only.