Email Authentication: Page 8
Browse Palisade articles and guides in Email Authentication.
SPF hard fail vs softfail: which should you use?
SPF hard fail (-all) vs softfail (~all): what each qualifier means, why hard fail breaks forwarded mail, and why ~all plus DMARC is right for sending domains.
Jul 19, 2026
What format do DMARC aggregate reports use?
DMARC aggregate reports use RFC 9990 XML data, commonly delivered as .xml.gz files. Learn the report fields, validation, and safe ingestion.
Jul 19, 2026
What does no MX record found mean in a bounce?
No MX record found in a bounce can mean no usable mail route, a null MX, DNS failure, or a bad address. Diagnose the DNS result and retest safely.
Jul 19, 2026
What does SMTP 550 permanent failure mean?
SMTP 550 permanent failure means a receiving server rejected an SMTP action. Use the enhanced code, response text, and command stage to diagnose it.
Jul 19, 2026
What does the DMARC adkim tag do?
DMARC adkim sets DKIM alignment to relaxed or strict. Learn how each mode compares domains, affects senders, and how to validate a safe change.
Jul 18, 2026
What does the DMARC fo tag mean?
The fo tag controls when receivers send failure reports, and does nothing without ruf. What each value asks for, and why large receivers often ignore it.
Jul 18, 2026
Why does Outlook show an unverified sender warning?
Outlook flags a sender as unverified when it cannot authenticate the From domain with SPF, DKIM, or DMARC. Find the failing path and fix it.
Jul 18, 2026
Why is Google sending MTA-STS TLS reports to my domain?
Google MTA-STS TLS reports explain SMTP TLS delivery results for your domain, the policy Google found, failures, and a safe validation workflow.
Jul 18, 2026
Can a domain have multiple DMARC records?
Can a domain have multiple DMARC records? No. RFC 9989 discards them all. Learn how to merge and validate one DMARC record, then verify DNS and mail flow.
Jul 18, 2026
Why does a DKIM checker say no record found?
DKIM checker says no record found? Verify the selector and signing domain, inspect the exact DNS query, fix the public record, and retest mail.
Jul 18, 2026
Mailgun SPF and DKIM Setup: Exact DNS Records
Set up Mailgun SPF and DKIM with the exact DNS records. Learn when to use DKIM CNAMEs, why send-only domains skip Mailgun MX, and how to verify alignment.
Jul 9, 2026
How do I set up SPF and DKIM for Postmark?
Postmark authenticates via its own Return-Path, so the include is unnecessary. Real setup: one DKIM TXT record plus a Return-Path CNAME for alignment.
Jul 9, 2026
How did the 2024 DMARC rules change MSP email protection for SMBs?
The 2024 DMARC rules pushed MSPs from passive monitoring to active enforcement for SMB clients: quarantine or reject policies, reports, and alignment.
Oct 3, 2025
8 DMARC tools for MSPs compared in 2026
Compare eight DMARC platforms for MSP workflows, with verified details on multi-tenancy, integrations, hosted records, reporting, and pricing.
Oct 2, 2025
How does DMARC affect cyber insurance and claims?
How DMARC impacts cyber insurance eligibility, claims, and premiums, practical guidance and a checklist for IT teams.
Oct 2, 2025
How can I set up Managed DMARC with Palisade?
Set up Palisade Hosted DMARC in minutes: add one CNAME, verify, and manage your policy from a slider, from p=none monitoring to full p=reject.
Oct 1, 2025
Why have only 61% of manufacturers adopted DMARC?
Only 61% of top manufacturers have DMARC, and just 19% enforce reject. Learn why and how to protect email.
Sep 30, 2025
Why is DMARC Vital for the Banking Industry?
Banks are prime targets for email fraud. See why DMARC matters, how far U.S. banks have adopted it, and how to roll it out to p=reject safely.
Sep 29, 2025
How Gmail’s Blue Verified Checkmarks Affect BIMI Adoption
Email authentication protocols like SPF, DKIM, and DMARC have become standard practice for protecting brand reputation, but many organizations still…
Sep 29, 2025
What Were the Major Email Security Highlights in September 2021?
September 2021 saw a flurry of email-related security news, ranging from regulatory actions to new protection tools. What regulatory action did the U.S.
Sep 29, 2025
What do Google's updated DMARC reports reveal?
Google’s DMARC aggregate reports now include diagnostic details about why an email fails sender authentication requirements.
Sep 29, 2025
DKIM vs SPF: The Difference and Why It Matters
SPF checks whether the sending server is authorized; DKIM signs the message so tampering shows. Here is how they differ and why you need both.
Sep 29, 2025
Should you DIY DMARC or use an automated service?
DIY DMARC or an automated service? Compare the real effort, hidden costs, and risks of each so you can pick the right path to p=reject enforcement.
Sep 29, 2025
What are Microsoft's new email authentication rules?
Microsoft announced it will enforce the same email authentication standards that Google and Yahoo already require.
Sep 29, 2025