Please refer to below how to adjust email space for email accounts in Smartermail
Note: Only email administrator own the right to create email account. If you wish to have administrator right for your email account, please submit us a ticket by using your primary email address so that we can enable domain administrator access for your email account.
1. Login to the web interface as administrator through URL : mail.yourdomainname.com and administrator user name with password.
2. Click on Settings icon > Domain Settings > Users.
3. You will see all the email users listed here. You can select the user and click on "Edit"
4. Here is there you can adjust the Mailbox Size Limit
5. Click Save to save the settings.