- Log in to webmail i.e. https://webmail.yourdomain.com with an email administrative account.
- On the top menu, click Domain Settings (gears with globe icon).
- On the navigation pane on the left click on Accounts.
- Select the email account you want to modify.
- Change the Mailbox Size Limit to the disk space size you would like to allocate to the email account.
- Click Save.
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