How to Send Email in Express.js (SMTP & API)

Here is how to send email in Express.js so it actually reaches the inbox.

Your options in Express.js

Use Nodemailer for SMTP or POST to an email API from your Express routes. (Nodemailer in a route handler, or an email API.)

Make it land, not bounce

• Authenticate your domain with SPF, DKIM and DMARC.
• Send from a dedicated, warmed IP.
• Handle bounces and complaints via webhooks.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus a REST API and an AI watching deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.