Hello @JasonS95054. I'm so sorry that you had to take so much time looking for a particular email. At this time, we can only sort alphabetically from A to Z and Z to A. This is a great feature request and I would be happy to put in feedback for you.
Although I understand that this suggestion is not a solution, I would like to recommend that you use folders to organize your emails. I see that you send out a lot of emails and putting your emails into folders could help reduce the amount of time to find a past email.