Thanks for this report, @sccr410. Please could you try these steps?
https://community.localwp.com/t/mailpit-not-starting-on-osx/41889/6
I recently added DevKinsta because I had a new project where I had to work with it (not one that I ever set up in LocalWP - totally separate site). The two do not at all seem to play nice as I can’t have both open at the same time.
This is normal, likely because both need the same port 80 to serve sites. You can’t have two apps using the same port, so you’ll have to use one or the other at once.
I also have to restart my computer after switching from one to the other.
This should not be required, at least for Local. You could try checking Activity Monitor for running servers such as nginx or apache after you quit both Local and DevKinsta, then kill those apps from Activity Monitor.