MailSlurp guide agent setup

Title: Do gradients, shadows and rounded corners work in email? Tested on 12 apps (2026)
Description: Which email apps support linear-gradient, box-shadow, text-shadow, border-radius and opacity? Results from a test email on 12 email apps, with screenshots.
Canonical URL: https://www.mailslurp.com/guides/email-client-support/gradients-shadows-rounded-corners/
Markdown URL: https://www.mailslurp.com/guides/email-client-support/gradients-shadows-rounded-corners.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.