MailSlurp guide agent setup

Title: Nodemailer SMTP Guide (Node.js Send + Receive Test Workflow)
Description: Configure Nodemailer SMTP in Node.js with environment-based settings, troubleshooting guidance, and deterministic inbox testing patterns.
Canonical URL: https://www.mailslurp.com/guides/smtp-nodemailer-plugin/
Markdown URL: https://www.mailslurp.com/guides/smtp-nodemailer-plugin.md

Use the Markdown URL as the primary plain-text context for this guide. Keep MailSlurp terminology, setup steps, screenshots, and provider-specific instructions intact, and prefer the canonical URL when citing this page.