Insights on email authentication, DMARC compliance, and securing your domain.
"DNS Authentication: DMARC Fail" is Mimecast's inbound hold verdict. Decode the string, read the headers, and fix it as admin or sender.
Compare 9 DMARC reporting tools on RUF parsing, source naming, retention, and export — with dated, source-linked pricing. Find the depth your rollout needs.
Seeing "MTA-STS policy is missing: STSFetchResult.NONE"? Diagnose it in 3 stages — DNS TXT record, HTTPS policy fetch, TLS cert — with copy-paste commands.
Every SPF record syntax element in one reference: mechanisms, qualifiers, modifiers, macros, and DNS limits — with RFC 7208 section cites and real examples.
Generate a TLSA record with OpenSSL, publish it, then fix the common DANE 3 1 1 mismatch. Copy-paste commands plus a free TLSA record checker. Step by step.
DMARC subdomain policy sets how subdomains inherit p=, sp=, and np=. See the DMARCbis tree walk, sp= vs np=, and how to stop non-existent-subdomain spoofing.
PCI DSS v4.0.1 Section 5.4.1 mandates anti-phishing controls — and names DMARC, SPF, and DKIM as examples, not requirements. See what your auditors expect.
Compare every genuinely free DMARC tool in 2026: no-signup checkers, free DMARC analyzers, and free monitoring tiers, with verified limits and when to upgrade.
Looking for a Valimail alternative? Compare transparent per-domain pricing, self-serve signup with no demo gate, and 9-protocol DMARC coverage. Check free.
Weighing a PowerDMARC alternative? Compare real pricing ($8–$250/mo), protocol coverage, honest reviews, and a zero-gap migration path before you switch.
Set up DKIM the right way: how signing works, choosing 2048-bit keys, finding your selector, and publishing the record. A 2026 guide — check yours free.
BIMI puts your logo in the inbox — but 28% of records break. Here's how to set up BIMI: the DNS TXT record, SVG Tiny PS logo, and VMC vs CMC. Check yours free.
Microsoft 365 = 19.6%, Google Workspace = 13.6% of 3.08M SPF-enabled domains (DMARCguard scan, Mar 2026). The 2026 email provider market share, sourced.
DORA compliance for email, mapped to Articles 9, 10 and 11. How DMARC, SPF, MTA-STS and TLS-RPT meet the regulation's data-in-transit duties.
Only 0.3% of 5.5M domains publish MTA-STS; 0.0% publish DANE. Get the per-scenario verdict, RFC 8461 vs 7672, Microsoft's connector modes, and NIS2 fit.
Email deliverability monitoring: the protocol signals that predict spam-folder placement, the metrics to track, and the tools that surface each one.
Does HIPAA require DMARC? Not by name. How §164.312 technical safeguards map to DMARC, SPF, DKIM, MTA-STS, TLS-RPT — plus the Dec 2024 NPRM.
How to create a DMARC record step by step — tags, syntax, real examples, and the p=none → p=reject rollout. Verify it with a free DMARC checker.
30.4% of 5.5 million domains have DMARC; only 12.8% enforce p=quarantine or p=reject. The 2026 enforcement gap, with sources. Run a free check.
Set up DMARC for Google Workspace step-by-step: the exact TXT record, where to publish it, and the p=none to reject rollout. 2026 guide.
Emails landing in spam? 40.8% of 5.5M scanned domains have no email authentication. Use this authentication-first checklist to get back in the inbox.
NIS2 compliance: map Article 21(2) to email auth — DMARC, SPF, MTA-STS, DANE, TLS-RPT. The control map, copy-paste DNS checks, and a 2026 readiness plan.
RFC 9989 replaces RFC 7489 as DMARC's Standards-Track spec (May 2026). What changed: the RFC 9990 aggregate / 9991 failure split, tree walk, pct removed.
Honest comparison of 6 DMARC monitoring tools in 2026: protocol coverage, pricing verified May 2026, free-tier limits, MSP fit. Pick the right one.
Comparing the best dmarcian alternatives in 2026. Protocol coverage (9 vs 3), pricing, free tiers, switcher quotes, and a step-by-step migration guide.
Read DMARC aggregate reports field by field. Annotated XML, Google vs Microsoft variants, and a live drawer demo. Free analyzer inside.
Copy-paste a working MTA-STS DNS record and .well-known policy file. RFC 8461 examples for Google Workspace, Microsoft 365, Postfix, plus mode progression and validators.
Vendor-neutral DMARC guide for MSPs: real wholesale pricing, multi-tenant ops, PSA integrations, 2026 compliance pressure, and ROI math — without the partner-program pitch.
TLS-RPT reports tell you when SMTP TLS fails between mail servers. See an annotated RFC 8460 JSON example, every result type, and how to set it up.
ARF (Abuse Reporting Format, RFC 5965) is the standard for DMARC forensic reports and email feedback loops. Annotated sample inside.
DKIM2 is the IETF's per-hop chained-signature successor to ARC and DKIM. Five drafts, four contested questions, and what email admins track in 2026.
DANE binds TLS certificates to DNS via DNSSEC — but only 30 of 5.5M scanned domains use it. Inside RFC 7672, TLSA records, NIS2, and DANE vs MTA-STS.
ARC email authentication preserves SPF, DKIM, and DMARC verdicts across forwarding hops in 2026. See real i=1 and i=2 headers, cv=fail debugging, and trusted-sealer fixes. Analyze a chain free.
Microsoft enforces DMARC for Outlook senders since May 5, 2025. Set up DMARC for Office 365 and Microsoft 365 step-by-step with DNS examples. Configure now.
Google, Yahoo, and Microsoft now require DMARC for bulk senders — including Gmail's 2025 SMTP rejection escalation. See the full compliance checklist.
Forwarded emails fail DMARC because SPF breaks in transit. See why, when DKIM survives, and how ARC seals the chain across every forwarding hop.
MXToolbox SuperTool covers lookups but stops at DMARC monitoring. Compare free alternatives — DMARCguard, EasyDMARC, dmarcian, PowerDMARC — with real pricing and what Reddit recommends.
148,655 domains exceed the SPF 10-lookup limit. Learn what SPF flattening is, when to use it, 4 safer alternatives, and step-by-step fixes. Check free.
53.6% of domains use SPF softfail, 40.2% use hardfail. Learn how each qualifier works, how DMARC changes the equation, and which to choose. Check your SPF free.
SPF PermError breaks DMARC alignment and kills deliverability. Learn the 5 causes, step-by-step fixes, and platform-specific examples. Check your SPF free.
DKIM failing? Learn why DKIM alignment breaks, how to fix body hash errors, and how to configure third-party senders. Step-by-step guide with CLI commands.
See 'DMARC quarantine/reject policy not enabled'? Learn what it means, why it matters, and how to fix it step by step for any DNS provider. Free checker included.
EasyDMARC's Plus plan runs $44.99/mo with TLS-RPT and MTA-STS on Premium. Compare alternatives on pricing, protocol coverage, free tiers, and migration effort.
DMARC failed? Fix it fast: 7 causes (SPF/DKIM misalignment, third-party senders, forwarding) with diagnose steps, fixes, and a free DMARC checker.
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