Add a mailbox, keep its password safe, reset it, change its size, delete it, and set up aliases and forwarding.
Updated 27 Oct 2026
Mailboxes live on the Mailboxes page of the Business Email app. Owners and Admins can add, change and delete them. You need to have bought at least one mailbox on the Plan page first, and your domain must be connected to the site.
@, for example hello. The form checks as you type that the address is free.Some names are kept for the mail system, such as postmaster. If you pick one, the form asks for another. Use letters, digits, dots and dashes only.
If all the mailboxes you bought are in use, the form offers Buy another mailbox. A site can have up to 10 mailboxes. To have more, email us.
When the mailbox is created, the screen shows its password with a Copy button. This is the only time you will see it. We do not keep it. Copy it and give it to whoever will use the mailbox. If it is lost, reset it.
The old password stops working straight away, and mail apps that were signed in with it will ask for the new one. The new password is shown once, like the first.
Choose Change size in the row menu and pick a size from 2 to 25 GB. It costs nothing. You cannot choose a size smaller than the mail the mailbox already holds. Choose a bigger size, or delete mail first.
Deleting is permanent. It removes the mailbox and all its mail, and it cannot be undone.
The mail is cleared first. If that cannot be done right now, the mailbox is not deleted and you see a message saying so. No mail is lost. Its password may have been reset on our side, so if it stops working, choose Reset password. Try deleting again in a minute. Creating the same address again later starts empty.
Deleting a mailbox does not lower your bill. To pay for fewer mailboxes from the next renewal, change the count on the Plan page. See Business Email billing and renewal. If you want a copy of the mail first, add the mailbox to a mail app and copy the folders across before you delete it.
An alias is an extra address, like [email protected], that delivers into one or more of your mailboxes. Aliases are free, up to 20 for a site.
You cannot use an address that is already a mailbox or an alias.
Forwarding sends a copy of a mailbox's mail to an address outside your domain.
Forwarding to Hotmail or Gmail can get your mail marked as spam. If you can, add the mailbox to your phone or to Outlook instead. See Set up email on your devices.
Can Editors on my team add mailboxes? No. Owners and Admins can. Editors can look at the pages only.
Can FastCloud staff read my mail? Only after you ask us to. Every action by staff on your domain is recorded with the name of the person who did it.
It says ContentMetric could not reach the mail server. Nothing was changed. Try again in a minute.