MailSlurp guide agent setup

Title: Preview and Test Email Campaign Rendering on Gmail.com
Description: Preview a sent campaign in Gmail's browser view with MailSlurp. Check the photograph, service columns, booking action and complete footer alongside mobile results.
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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.