MailSlurp guide agent setup

Title: Apple Mail and iPhone Mail email support: CSS, images and video (tested 2026)
Description: Which CSS and HTML work in Apple Mail on Mac, iPhone and iPad? Results from test emails on real Apple devices in November 2026, with screenshots.
Canonical URL: https://www.mailslurp.com/guides/email-client-support/apple-mail/
Markdown URL: https://www.mailslurp.com/guides/email-client-support/apple-mail.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.