Email Spam Checker

An email spam checker analyses your outgoing messages against known spam filter rules before you hit send. By uploading your .eml file, you can identify content patterns, authentication failures, and formatting issues that major providers like Gmail and Outlook use to route messages to the spam folder.

Modern spam filters evaluate dozens of signals simultaneously — your SPF/DKIM/DMARC records, the ratio of HTML to plain text, subject line keywords, link density, and sender reputation. A dedicated spam checker consolidates these checks into a single report, giving you a prioritized list of fixes rather than requiring you to investigate each factor manually.

ISP Deliverability's spam checker produces heuristic inbox placement scores for Gmail and Outlook alongside AI-powered recommendations. Unlike seed-account services that take hours, our analysis runs in seconds and covers every major deliverability signal in one place.

What our spam checker tests

• SPF, DKIM, and DMARC authentication status
• Subject line spam triggers and capitalization abuse
• HTML-to-text ratio and script tag detection
• External link density and tracking pixel detection
• Missing List-Unsubscribe headers