(Mac) Allow a default to not save sent items, and checkbox to save
One of my favorite features on the PC version of Outlook 2016 is the ability to set it to not save a copy of sent email by default. 99% of the email messages I send each day are not something I care about ever seeing again; answering questions of an inconsequential nature, yes/no's, etc. For that reason, on the PC version, I set it to not save a copy, and for the few messages per day that do matter, I simply click the button to save to Sent Items. It greatly reduces the clutter of pointless messages in my Sent Items, and facilitates far more effective searching.
The Mac version does not have this feature for some reason. It would have to be incredibly simple to implement.
Lisa P commented
PLEASE add this. Or at a minimum provide an option to not save an individual sent email. So much clutter in my sent items as a result of this missing feature.