MailSlurp guide agent setup

Title: How to send an HTML email in Outlook, and what recipients will see
Description: Send an HTML file as an email from classic Outlook, what to do in new Outlook and Outlook on the web, and how each Outlook renders the result, from our tests.
Canonical URL: https://www.mailslurp.com/guides/email-client-support/send-html-email-in-outlook/
Markdown URL: https://www.mailslurp.com/guides/email-client-support/send-html-email-in-outlook.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.