How to check the size of a mailbox? (Setting limitations, etc.)

To manage the size of a mailbox, follow these steps after logging in to the web-based admin panel (more information available here):

1. Go to "Manage" > "Accounts" > Select the account and click on it to open the context menu, then choose "Edit."
   
2. Next, select the "Advanced" account settings and modify the account limit. (Setting it to 0 means unlimited)
   

To view the space occupied by individual accounts:

1. Select "Control."
   
2. Then, choose "Domains."
   
3. You will find a list of connected domains. Double-click on a domain to open the control page.
4. In the left menu, select "Mailbox Quota."