MailSlurp guide agent setup

Title: SMTP Server Guide: What It Does, Examples, and How to Test It
Description: Learn what an SMTP server is, how SMTP server flow works, common host, port, TLS, and authentication settings, and how to test delivery with MailSlurp before release.
Canonical URL: https://www.mailslurp.com/guides/what-is-an-smtp-server/
Markdown URL: https://www.mailslurp.com/guides/what-is-an-smtp-server.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.