Would love change in original sent email Rated 4 out of 5 stars

I'm not exactly sure what this does, but is there a way to change it in the original sent email subject header? I hate when people change the subject in a thread of emails. I wish I could change it ot organize them. Thanks.

This review is for a previous version of the add-on (2.0.2).  This user has a previous review of this add-on.