Email Security Analysis of longmontcolorado.gov

Complete verification of longmontcolorado.gov'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 ip4:69.87.213.0/24 include:spf.protection.outlook.com ~all

Selectors: selector1, k1

v=DMARC1; p=reject; rua=mailto:dmarc@longmontcolorado.gov; ruf=mailto:dmarc@longmontcolorado.gov; sp=reject; fo=1; adkim=s; aspf=s

longmontcolorado-gov.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.

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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.