Change a mailbox password or quota

Set a new password for an email account in cPanel, or change how much storage it is allowed to use.

Both are done from the same screen in cPanel. Applies to shared, reseller and cPanel hosting.

To reach cPanel: sign in directly, or go to the client area → Services → My Services and select Launch cPanel beside your plan.

Change the password

In cPanel, open Email Accounts in the Email section.
Select Manage beside the address.
Enter the new password under New Password. The eye icon reveals what you have typed; Generate creates a strong password, and the arrow beside it sets the length and character types.
Select Update Email Settings.

Use Generate rather than inventing a password. Mailbox passwords are attacked continuously by automated login attempts, and a compromised mailbox leads to an outbound block.

Changing the password signs out every device using that mailbox. Update your phone, your desktop mail app and any application that sends through SMTP, or they will keep retrying with the old password and can trigger a login-failure block.

Change the quota

In cPanel, open Email Accounts.
Select Manage beside the address.
Change Storage Space, or set it to unlimited.
Select Update Email Settings.

Mailbox storage counts towards your account's total disk allowance, so setting a mailbox to unlimited does not create space — it only removes the per-mailbox ceiling. Fair usage limits still apply; see Email storage limits.

If a mailbox is full

Raising the quota is the quick fix, not the right one. To recover space:

Have the user delete large messages from their mail app or webmail, then empty Trash — mail stays on disk until Trash is emptied.
Use Email Disk Usage in cPanel to find and remove old messages in bulk, filtered by age or size.

Verify

Signing in to webmail with the new password succeeds.
Email Accounts shows the new quota and current usage.