Is there a way to monitor the delete folder on a mailbox account?

I am monitoring the mailboxes and it is working excellent! however, my app continuously polls the mailboxes and retrieves the email/attachments. therefore, most readings are going to be zero, unless the app is down or broken, then mails would build up in mailbox. I need to look at the delete folder of the mailbox so I can monitor an increase in emails, example, in a days time, mails will be processed, mailbox empty, delete folder increases. so if it doesn’t increase we know there is a problem at the clients side.
thank you