Beyond the preview, MailViewr runs a pre-send QA report on your HTML and scores it out of 100. Every run is downloadable as a PDF you can hand to a client, attach to a ticket, or keep as an audit record before a send goes out.
The report also carries a SpamAssassin score with a per-rule breakdown and a cross-client compatibility check. Read what goes into an HTML email QA report, or see how the Email Readiness score is calculated.