It would be nice to be able to select several old emails that you want to delete instead of having to delete them one at a time.

You can. If you check the box on the left instead of clicking the X on the right, you can then click the button at the bottom of the page to delete all the checked messages/threads.

That only works for your personal emails. If you have sent several emails to the class, you must delete them one at a time as there is no way to select several to delete at once.

Ahh. People typically don't make mass purges of past Email the Class messages, especially since you can sort the table to find particular ones (click on a column header to sort by that column).

Perhaps they typically don't because they CAN'T! Hmmm?
I do, and it is tedious...

Well, I'll pass it along for review and consideration.

Tank yew berry mulch