Free tools · Email security
DMARC, SPF & DKIM checker.
Can someone send email that looks like it came from your company? Find out in seconds, and see exactly which record to fix.
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The full Safety Check grades encryption, browser protection, sessions, attack filtering, AI agents, software, third parties, email and reputation, and shows exactly which gaps SENTRA closes.
Questions
What you should know.
What happens without DMARC?
Anyone can send phishing email that appears to come from your domain, and you never hear about it. Receivers have no instruction to reject it.
Is p=none enough?
No. p=none only collects reports; spoofed mail is still delivered. Move to quarantine, then reject.
How does SENTRA help?
SENTRA monitors SPF, DKIM, DMARC and MTA-STS every day and alerts your admins the moment a record weakens or disappears.