What's the simplest way to add email to my SaaS?

The simplest way is usually to use a transactional email provider instead of running your own mail server.

Easiest path

Pick one of these:

• Resend — very simple developer experience
• SendGrid — common, lots of features
• Postmark — excellent for transactional email
• Amazon SES — cheaper, but a bit more setup

What you typically need

1. Sign up for the provider
2. Verify your domain
   • add DNS records like SPF, DKIM, and sometimes DMARC
3. Use their API or SMTP
   • API is usually simpler in modern apps
4. Start with 2–3 email types
   • welcome email
   • password reset
   • notification / receipt email

Recommended simplest stack

If you want the fastest setup:

• Resend or Postmark
• React email or basic HTML templates
• Your app sends emails through the provider’s API

Minimal implementation pattern

Your app should have a small email service like:

• sendWelcomeEmail(user)
• sendPasswordResetEmail(user, token)
• sendInvoiceEmail(user, invoice)

So the rest of your app never deals with email provider details directly.

Important basics

• Don’t send email directly from your frontend
• Store the provider API key in environment variables
• Set up a real sending domain like mail.yourdomain.com
• Add unsubscribe links for marketing email
• Separate transactional email from marketing email

If you want the absolute simplest answer

Use:

• Resend
• a verified domain
• one small backend email helper
• a few templates

If you want, I can give you:

1. a step-by-step setup, or
2. a copy-paste email service example in Node, Python, or Rails.