MailSlurp guide agent setup

Title: HTML Email Spacing: Better Alternatives to Random NBSP Hacks
Description: Learn how to create reliable spacing in HTML email across Outlook, Gmail, and mobile clients using padding, tables, line height, spacers, and QA checks.
Canonical URL: https://www.mailslurp.com/guides/html-email-spacing/
Markdown URL: https://www.mailslurp.com/guides/html-email-spacing.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.