How to Automate Email Sending in Codex Using an MCP Server

Do you want to send emails directly from the terminal in your Codex environment? As an email deliverability expert building automated systems, I've wasted countless hours on email workflows. Testing transactional emails meant constantly switching between my IDE and email clients. This friction adds up quickly across every project. After testing SendLayer's MCP server integration, I discovered a better approach. You can now send email with Codex using simple natural-language commands. No app switching or manual formatting is required. In this tutorial, I'll show you how to automate email sending with OpenAI's Codex in under 5 minutes. Table of Contents What is SendLayer MCP? MCP tools available in SendLayer Prerequisites How to connect SendLayer MCP to OpenAI Codex Step 1: Create your SendLayer account Step 2: Retrieve your API key Step 3: Store your API key as an environment variable Step 4: Add SendLayer MCP to your Codex config.toml Step 5: Verify the connection How to send your firs