Email sending - HTTP 500 Error and Not found

System Information
  • Strapi Version: 3.2.5
  • Operating System: OSX
  • Database: Postgres
  • Node Version: 12.16.1
  • NPM Version: 7.21.0
  • Yarn Version: -

I’m trying to understand what is wrong with the built-in email sender.
I have the following plugins installed and configured - strapi-plugin-email, strapi-provider-email-nodemailer, strapi-provide-email-sendgrid - however, every time I try to post something to http://localhost:1337/email an HTTP 500 error “Not found” is returned.

Could someone kindly advise on how to troubleshoot this?

Thank you!