email API for Vercel

If you want to send email from a Vercel app, the most common options are:

1) Vercel + Resend

This is probably the easiest setup for Next.js on Vercel.

Install

npm install resend

API route example

// app/api/send-email/route.js
import { Resend } from "resend";

const resend = new Resend(process.env.RESEND_API_KEY);

export async function POST(req) {
  const { to, subject, text } = await req.json();

  try {
    const data = await resend.emails.send({
      from: "Your App <onboarding@resend.dev>",
      to,
      subject,
      text,
    });

    return Response.json({ success: true, data });
  } catch (error) {
    return Response.json({ success: false, error: error.message }, { status: 500 });
  }
}

Env var

RESEND_API_KEY=your_key_here

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2) Vercel + SendGrid

Good for more traditional email delivery.

Install

npm install @sendgrid/mail

Example

import sgMail from "@sendgrid/mail";

sgMail.setApiKey(process.env.SENDGRID_API_KEY);

export async function POST(req) {
  const { to, subject, text } = await req.json();

  try {
    await sgMail.send({
      from: "your-verified-sender@example.com",
      to,
      subject,
      text,
    });

    return Response.json({ success: true });
  } catch (error) {
    return Response.json({ success: false, error: error.message }, { status: 500 });
  }
}

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3) Vercel + Postmark

Very reliable for transactional email.

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4) Vercel + Nodemailer + SMTP

Works if you already have an SMTP provider, but less ideal for serverless than dedicated email APIs.

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Recommendation

For most Vercel/Next.js apps:

• Resend = easiest and modern
• SendGrid = flexible and widely used
• Postmark = best for transactional deliverability

If you want, I can give you:

1. a complete Next.js API route for Vercel,
2. a React form that sends the email, or
3. the best email provider comparison for Vercel.