Email Security Analysis of gchq.gov.uk

Complete verification of gchq.gov.uk's SPF, DKIM, DMARC, and MTA-STS records. Find out if this domain is protected against email spoofing.

Last updated: April 15, 2026

90A

This domain is protected against spoofing

v=spf1 include:spf.protection.outlook.com -all

Selectors: selector2

v=DMARC1;p=reject;adkim=s;aspf=s;rua=mailto:dmarc-rua@dmarc.service.gov.uk;

gchq-gov-uk.mail.protection.outlook.com

Missing

No record found

1Add MTA-STS to enforce TLS encryption for incoming emails
Without MTA-STS, an attacker performing a man-in-the-middle attack can downgrade the connection between mail servers to plaintext, intercepting emails in transit. MTA-STS tells sending servers to only deliver via TLS with a valid certificate, preventing downgrade attacks.

Run a live analysis

The results above are updated daily. For an instant check of gchq.gov.uk, run a live analysis.

Understand how SPF defines which servers are authorized to send emails for a domain.

Discover how DKIM cryptographically signs your emails to guarantee their authenticity.

Learn how DMARC orchestrates SPF and DKIM to protect your domain.

Learn how MTA-STS enforces TLS encryption to protect your emails in transit.

Compare the three protocols and understand how they work together.