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Outlook Split Lint

Outlook Email HTML Lint - Classic vs New

Classic Outlook renders with the Word engine, the new Outlook with WebView2. Lint one email file against both at once, line by line, before you send.

What it does for free

Check the open email file against both Outlook engines
Check only the lines you select
Reopen the last findings list
List every rule that ships inside

With a licence

Scan the whole template library — Walks every email file in the workspace in one pass instead of one open file.
Export a report you can hand over — Writes the findings to CSV, JSON or HTML so a client or a colleague can read them.
CI output — Machine-readable JSON so a build step can stop a broken template before it ships.

Email on Acid Basics is $99/month and Litmus Core starts at $500/month (checked 2026-09-07). This licence is $29, once.

Install

ext install outlook-email-html-lint