Email News6 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.
Read article →Practical insights for safer email.
Guides, product updates, and email security news from the Palisade team.
Page 4
More resources
60 articles
DMARC Guides7 min read
Fix '550 5.7.1 Unauthenticated Email Is Prohibited'
The 'unauthenticated mail is prohibited' bounce means DMARC rejected your message. How to diagnose SPF/DKIM alignment and fix delivery fast.
Read article →
Email News5 min read
Top 10 Reasons Why DKIM Fails
Top 10 reasons DKIM fails: wrong selectors, DNS errors, key length, forwarding, and how to fix each so your email passes authentication.
Read article →
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.
Read article →
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.
Read article →
Email News7 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.
Read article →
DMARC Guides5 min read
DMARC: questions about mail sending and mail receiving
Common DMARC questions answered: how policies affect mail you send and receive, what alignment means, and how to avoid losing legitimate email.
Read article →
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.
Read article →
Email News7 min read
How to Prevent ARP Spoofing Attacks
Learn how to detect and prevent ARP Spoofing with practical, effective strategies.
Read article →
Email News8 min read
Introduction to SPF Records
If you're involved in managing email deliverability for your tech company, you may have come across the term 'SPF record.' An SPF record, which stands for…
Read article →
Email News6 min read
Setting Up a DKIM Record for Email Security
Set up a DKIM record step by step: generate a 2048-bit key, publish the DNS TXT record, verify signing, and fix the errors that break DKIM.
Read article →
Email News8 min read
In-Depth Guide to Understanding and Implementing DMARC and DKIM
DKIM, or DomainKeys Identified Mail, is an email authentication method that associates a digital signature with an email message.
Read article →