React App + Node.js + Heroku = doesn't work

Hey.
I’m deploying a simple React app (https://projectslist.herokuapp.com/) to Heroku. It works just fine except for node server part which doesn’t work at all. Logs tell me that I have 404 on my only server method - /sendmail. What should I do to fix it?
My repo - GitHub - VasVV/Projects-list

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