I'm building a SaaS with Next.js and Supabase. What's the simplest email API?

If you want the simplest email API for a Next.js + Supabase SaaS, I’d usually recommend one of these:

Best simple choice: Resend

Why it’s simple:

• Very clean API
• Great for transactional emails
• Easy to use with Next.js
• Good DX, minimal setup
• Works well for signup emails, magic links, password resets, notifications

Example:

import { Resend } from "resend";

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

await resend.emails.send({
  from: "Acme <onboarding@acme.com>",
  to: "user@example.com",
  subject: "Welcome!",
  html: "<p>Thanks for signing up.</p>",
});

Also good: Postmark

• Very reliable
• Excellent for transactional email
• Slightly more “enterprise” feel than Resend
• Still pretty simple

Cheapest/easiest if you’re already in AWS: Amazon SES

• Powerful and cheap
• But more setup and less beginner-friendly
• Not the simplest choice

If you want marketing + transactional in one:

• SendGrid or Mailgun
• More features, but more complexity than Resend

My recommendation

For a SaaS built with Next.js + Supabase, I’d pick:

Resend

because it’s the easiest to implement and feels very modern for product/email workflows.

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Supabase-specific note

If you’re using Supabase Auth, you may not even need a separate email API for:

• magic links
• signup confirmations
• password reset emails

Supabase can send those itself via its auth email templates and SMTP settings.

If you need product emails like:

• onboarding
• alerts
• invoices
• digest emails

then use Resend.

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If you want, I can also give you:

1. the simplest production-ready setup for Next.js + Resend, or
2. a comparison table of Resend vs Postmark vs SES vs SendGrid.