Mail Security & Deliverability Checker

Free online tools to test SPF, DKIM, DMARC, MX records, DNS blacklists, reverse DNS and SMTP/STARTTLS. Run a one-click Mail Security Check, get a 0–10 score with per-record findings and download a shareable PDF report.

Mail Security Anti-Spoof Inbound Health MX SPF DMARC DKIM DNS PTR Blacklist SMTP Relay WHOIS Headers

Open Relay test — gmail.com FAIL

Connect failed: Connection timed out (110)