Email Authentication8 min read
How do I fix the 'No DMARC record found' warning?
Fix the 'No DMARC record found' warning: create and publish a DMARC TXT record in DNS, then verify it, a step-by-step guide with examples.
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Guides, product updates, and email security news from the Palisade team.
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61 articles
Email Authentication11 min read
What Is an A Record? How DNS A Records Work
An A record is the DNS record that maps a hostname to an IPv4 address. Learn its syntax, TTL, multiple A records, how mail uses it, and how to check yours.
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Email News12 min read
Office 365 Quarantine: Protecting Your Organization
Office 365 quarantine explained: how Microsoft filters suspicious mail, how admins review and release messages, and how to tune your policies.
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Security8 min read
How do I prevent phishing attacks and protect sensitive information?
Phishing is a malicious activity aimed at tricking individuals into revealing their sensitive information, such as usernames, passwords, and financial…
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Security12 min read
ARP Poisoning: What it is and How to Prevent
ARP poisoning lets attackers intercept traffic on your local network. Learn how the attack works and the defenses that stop it.
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Email News12 min read
What Is a CNAME Record? How DNS Aliases Work
A CNAME record makes one hostname an alias for another. Learn how CNAMEs resolve, the no-other-data and MX rules, the apex limit, and how to check one.
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Email News8 min read
DNS TXT Record Lookup: dig, nslookup & Online Tools
Look up DNS TXT records with dig, nslookup, PowerShell, or our free online checker. Find and interpret SPF, DKIM, DMARC, BIMI, and verification records.
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Email News6 min read
DKIM Failure: How to Diagnose and Fix It
Diagnose DKIM failure from received email: check the selector, public key, body hash and signing path, then retest the affected sender before changing DNS.
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Security6 min read
Understanding what a Baiting Attack is
Baiting attacks lure victims with free downloads or infected USB drives. See real examples and the defenses that stop this tactic.
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Security7 min read
DKIM Selectors: Multiple Keys and Safe Key Rotation
How to run several DKIM selectors at once and rotate signing keys without breaking authentication: the DNS layout, the cutover order, and what to avoid.
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Email News9 min read
How to Create an SPF Record (Step-by-Step + Examples)
Build a valid SPF record in minutes: syntax, the 10-lookup limit, real examples for Google Workspace and Microsoft 365, and a checker to verify it.
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Email News9 min read
How much does it Cost to Trademark a logo?
How much a logo trademark costs: USPTO filing fees, attorney costs, and timelines, plus why a registered logo matters for BIMI email branding.
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