Prerequisites

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

1. Get the Resend SMTP credentials

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

  • Host: smtp.resend.com
  • Port: 465
  • Username: resend
  • Password: YOUR_API_KEY

2. Integrate with Customer.io SMTP

After logging into your Customer.io account, you’ll need to enable the SMTP integration.

  1. Go to Settings > Workspace Settings.
  1. Go to the Messaging tab and select Email.
  1. Select the Custom SMTP tab and click Add Custom SMTP Server.
  1. Select Other SMTP and click Continue to set up.
  1. Copy-and-paste the SMTP credentials from Resend to Customer.io.

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