Email on Contact not sending

I need some help. I’m a web guy so I’ve tried to track this down.
At my site I cannot get the contact mageewp shortcode to work.
It says it sent the email but it never does. (I’m not dumb enough to have not checked spam).
Also, when I go to plugins in wordpress it says “Activate” under mageewp shortcodes. I click it.
It then says “Plugin activated” at the top, but still “Activate” below it in the list. Perhaps it’s not really activating it?

Also, where is the code that fires when you click submit. In the shortcode I don’t see a reference to any action.
And I’ve searched the plugin folder and cannot find anything that lets me know where the email sending code is.

https://wordpress.org/plugins/magee-shortcodes/