How to find and delete all the emails that are bigger than 30MB in size?

Step 1 : Login to your webmail using the URL https://yourdomainname.com:2096/

Step 2: Click on Webmail home on the left pane.

Step 3: Scroll down and click on Manage Disk Usage.

Step 4: Choose a folder and click Manage. For example: Trash

Step 5: Choose 30MB in size or more under the Messages to delete from the drop-down.

Step 6: Click on Delete permanently button.