Email in the app v0 builds.

Add email sending with Notix (npm package notix-js, docs at https://usenotix.dev/docs).
Send from a server-side route only, reading the key from the NOTIX_API_KEY
environment variable. Never put the key in client code. Use a Next.js route handler under app/api.

import { Notix } from "notix-js";

const notix = new Notix(process.env.NOTIX_API_KEY!);

export async function POST(request: Request) {
  const { to } = await request.json();
  const { data, error } = await notix.emails.send({
    from: "Acme <hello@acme.com>",
    to,
    subject: "Welcome to Acme",
    html: "<p>Glad you are here.</p>",
  });
  if (error) return Response.json({ error }, { status: 502 });
  return Response.json({ id: data?.emailId });
}