MailSlurp guide agent setup

Title: Email Preheader Text: Make the Inbox Preview Worth Reading
Description: Write useful email preheader text, check what Gmail and Outlook display, and prevent your inbox preview from filling with footer or browser-link text.
Canonical URL: https://www.mailslurp.com/guides/email-preheader/
Markdown URL: https://www.mailslurp.com/guides/email-preheader.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.