Email Development & Testing

HTML emails break in places normal pages never do, especially in Outlook. These guides explain the formats and testing steps that stop surprises before you hit send.

EML vs MSG: What's the Difference?

Published on October 27, 2026 by Hasnain

EML vs MSG explained: file structure, Outlook compatibility, which email format to save, how to convert MSG to EML and preview EML files free online.

Email Development & Testing

What Is MJML? Responsive Email Markup Explained

Published on October 27, 2026 by Hasnain

MJML is an open-source markup language that compiles to responsive, table-based HTML email. Learn how it works, its pros and cons, and try it free online.

Email Development & Testing

How to Send a Test Email With Mailpit, ngrok, and Email Viewer

Published on September 15, 2026 by Hasnain

Set up a free local email testing inbox with Mailpit and ngrok, then send test emails from Email Viewer to check headers, HTML, and multipart structure before a real send.