MailSlurp guide agent setup

Title: MJML, React Email, Maizzle and Foundation for Emails: the same email tested on 12 apps (2026)
Description: One order email built in MJML, React Email, Maizzle and Foundation for Emails and rendered on 12 email apps. See what stacked on phones and broke in Outlook.
Canonical URL: https://www.mailslurp.com/guides/email-client-support/email-frameworks/
Markdown URL: https://www.mailslurp.com/guides/email-client-support/email-frameworks.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.