> ## Documentation Index > Fetch the complete documentation index at: https://resend.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Send emails using Retool with SMTP > Learn how to integrate Retool with Resend SMTP. ### Prerequisites Before you start, you'll need: * A Resend [API key](/create-an-api-key) * A [verified domain](/add-a-domain) ## 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 Retool SMTP Log into your [Retool](https://retool.com) account and create a new SMTP Resource. 1. Go to **Resources** and click **Create New** Retool SMTP - Create new Resources 2. Search for **SMTP** and select it Retool SMTP - Search for SMTP 3. Add name and SMTP credentials Retool SMTP - Add SMTP credentials