That is potentially a much more complicated question.
The simplest, base-ish monday solution is if you can use this:
If not, the direction I would go would be to use a webhook call from an update update receipt to call an Integromat senario. But there are many possible solutions. The primary factor is how the email would be linked to the item.
If I setup your automation suggestion using Gmail integrations but also setup the Communihub, would emails arrive into communihub? I am not sure if you have to first email through communihub or if it catches all emails from the listed email address.
I’ve only looked at Communihub briefly. I do know that it does work with Gmail. I do not believe that the initial emails would have to be initiated through Communihub.