- it shows whom you received an email last, thereby allowing it to be your default view,
- keeps your inbox clean and neat, automatically, 
- makes it easy to see what is important and what is not,
- implements better threading (because threads based on subject lines fall apart very quickly),
- separates commercial emails from emails from friends and family without filters, and
- allows for very quick cleaning and organizing of emails, if you wanted to put them in folders or delete them. 

Is there any way to achieve the above? Maybe with a plugin of some sort? Thanks! Explanation (if you had any questions why this feature would be needed at all): This is a great way of sorting/viewing your emails by people rather than individual emails, while also maintaining the sorting of emails by date: - it shows whom you received an email last, thereby allowing it to be your default view, - keeps your inbox clean and neat, automatically, - makes it easy to see what is important and what is not, - implements better threading (because threads based on subject lines fall apart very quickly), - separates commercial emails from emails from friends and family without filters, and - allows for very quick cleaning and organizing of emails, if you wanted to put them in folders or delete them. Some email clients implemented such feature in the past, sadly they are no longer available, not available for Linux, or no longer supported (Poco Mail for Windows, or Unibox for Mac, for example). Thunderbird is the most full-featured email client today, with many plugins available, and I was hoping there was a way to do this, but if it exists, I did not find it myself.