To get the most out of this guide, you’ll need to:

SMTP Credentials

When configuring your SMTP integration, you’ll need to use the following credentials:

  • Host:
  • Port: 25, 465, 587, 2465, or 2587
  • Username: resend
  • Password: YOUR_API_KEY

Ports help to instruct the type of security you want to use in your SMTP connection.

SMTPS465, 2465Implicit SSL/TLS (Immediately connects via SSL/TLS)
STARTTLS25, 587, 2587Explicit SSL/TLS (First connects via plaintext, then upgrades to SSL/TLS)


Once configured, you should be able to start sending emails via SMTP. Below are some frequently asked questions: