arelumes
My bad, I was going off older versions . I checked my config and email settings were not stored there.
You need to open up your flarum MySQL database and then go to the settings table. There, you will find mail_driver key and other mail related values. Edit the value for that respective key.
Here I use phpmyadmin to illustrate the mail settings values.

You had mentioned that the last thing you did was save the email settings so I am just assuming you want to correct them.