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1

Add 'build' script to ./package.json

2

Change 'Framework Preset' on Vercel's project settings to Next.js

You also need to add “next” on devDependencies to work properly:
This is a limitation on Vercel’s Next Framework Preset.
3

Change 'Output Directory' to .react-email/.next

In the end, your settings should look like this:
Proper Vercel settings