SpamChecker

Local-first phishing signals for Gmail.

SpamChecker analyzes every email you open in Gmail and gives you an instant danger rating — so you know whether to trust a message before you click anything. Gmail's built-in spam filter works at the server level and gives you no visibility into why a message looks suspicious. SpamChecker fills that gap by running a deep local analysis on every email you open, right in your browser. Nothing is ever sent to external servers. What SpamChecker checks: Email authentication — SPF, DKIM, and DMARC pass/fail status Sender analysis — From/Reply-To mismatches, domain spoofing signals Routing analysis — hop count, unusual relay paths, origin country Body analysis — phishing language, suspicious links, URL manipulation tactics Attachment analysis — dangerous file types, macro-enabled documents, disguised extensions What you see: A Danger rating from 1–25 with a clear LOW / MODERATE / HIGH verdict Top risk factors as readable labels with hover explanations Origin country of the email SpamChecker Pro unlocks full forensic detail — complete header breakdown, hop-by-hop trace, auth results, signal scoring, and body preview. EML file analysis is included free — drag and drop any exported .eml file for the same full analysis outside of Gmail. All analysis runs locally in your browser. No email content is transmitted or stored.