Some other way of accessing the user mailbox to delete unwanted email or accidentally email send to wrong person. As admin you have extra access through cli mode of the server. Below are simple step to delete it. You may access the zimbra server through ssh.
You must know which user you wanted to delete the email and which email base on from and subject that you wanted to delete. Below command will display the email content with 8 email in the list base on the date selected. So you wont have all email to be display in your console.
Ensure that you are using zimbra user before starting to check on the email list.
[[email protected] ~]# su – zimbra
Below are the result