Free tools
Combines MX, SPF, DKIM (common selectors), DMARC and STARTTLS support checks into a single 0-100 score, as a quick summary before digging into each individual tool.
It starts at 100 points and deducts for each missing control: no MX, no SPF, no DKIM detected, no DMARC, or no STARTTLS. It is a quick reference, not a security certification.
Review SPF and DMARC first (the quickest to fix), then confirm the real DKIM selector with your mail provider if the common selector was not detected.
Frequently asked questions
No, it reduces risk but does not eliminate it. Monitoring DMARC reports and training your team against phishing still matters.
Mail can work for sending and receiving without having anti-spoofing protections active; those are different things.