MailSlurp guide agent setup

Title: Send Email in JavaScript and Node.js with MailSlurp
Description: Developer-focused guide for sending email in JavaScript and Node.js with MailSlurp. Covers SendEmailOptions, HTML, attachments, templates, and delivery-safe patterns.
Canonical URL: https://www.mailslurp.com/guides/developers/sending-email/
Markdown URL: https://www.mailslurp.com/guides/developers/sending-email.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.