MailSlurp guide agent setup

Title: Gmail email support: CSS, images and dark mode (tested 2026)
Description: Does Gmail support style tags, media queries, flexbox and web fonts? Test emails rendered in Gmail on the web, Android and iPhone, with screenshots.
Canonical URL: https://www.mailslurp.com/guides/email-client-support/gmail/
Markdown URL: https://www.mailslurp.com/guides/email-client-support/gmail.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.