I have this project, as a way of studying, and I'm not finding a solution to a problem I'm having with sending emails. Running locally on my machine, it's working perfectly. However, when I upload it to Vercel, the email issue doesn't work and I don't know how to identify it or where to find the reason for the error. And I'm using sendgrid in my project.
Do you get any errors in the browsers console after deploying? Have you made sure to add any environment variables that are needed within Vercel?
If you’re able share some more context (error logs, code snippets, etc.) the community should hopefully be able to help a little more.
+1 on what Josh posted, I also wanted to share our guide on sending emails from within your app on Vercel. Hopefully this is helpful!
https://vercel.com/guides/sending-emails-from-an-application-on-vercel