Email Security Analysis of cisco.com

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

Last updated: April 15, 2026

75B

This domain is protected against spoofing

Warning

v=spf1 redirect=spfa._spf.cisco.comRead the guide

Selectors: selector1, s1, s2, zendesk1, zendesk2

v=DMARC1; p=reject; pct=100; sp=reject; fo=1; ri=3600; rua=mailto:ynldvgsr@ag.dmarcian.com; ruf=mailto:ynldvgsr@fr.dmarcian.com;

alln-mx-01.cisco.com, rcdn-mx-01.cisco.com, aer-mx-01.cisco.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.

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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.