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How secure is your email domain?
Get an instant A–F grade for any domain's email security — SPF, DKIM, DMARC and MTA-STS. Free, no sign-in.
SPF
Is only your mail server allowed to send as you?
DKIM
Are your messages cryptographically signed?
DMARC
Are spoofed emails rejected, and are you told?
MTA-STS
Is mail to you forced over encrypted TLS?
Email DNS is 4 of 71 checks.
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