How do I troubleshoot email delivery failures after implementing a DMARC record in Office 365?

How do I troubleshoot email delivery failures after implementing a DMARC record in Office 365?

ByBrad Slavin

To troubleshoot email delivery failures after implementing a DMARC record in Office 365, validate SPF/DKIM/DMARC alignment for your domain, analyze DMARC aggregate/forensic reports to pinpoint failing sources, use Office 365 Message Trace and Defender/EOP logs to confirm the failure path, correct SPF/DKIM and third‑party sender configurations, and roll out enforcement gradually—continuously monitored and guided by…

ChatGPT Gemini Users, Optimizely Vishing Breach, Telecom AI Protection

ChatGPT Gemini Users, Optimizely Vishing Breach, Telecom AI Protection

ByBrad Slavin

Last week was all about phishing, vishing, and spoofing attacks that kept the experts on their toes. While GPS spoofing attacks saw a sudden spike due to regional conflicts between the US and Iran, the ad tech brand Optimizely was targeted by a group of threat actors. Also, cybercrooks have been trying to exploit users…

How can a DMARC lookup help me troubleshoot suspected email spoofing or phishing attacks?

How can a DMARC lookup help me troubleshoot suspected email spoofing or phishing attacks?

ByBrad Slavin

A DMARC lookup helps you troubleshoot suspected email spoofing or phishing by verifying a domain’s DMARC/SPF/DKIM DNS records, interpreting policy and alignment settings, and correlating DMARC aggregate/forensic reports with messageheaders to identify the true source, delivery path, and exact configuration gaps to fix. DMARC (Domain-based Message Authentication, Reporting, and Conformance) works by aligning a message’s…

Phishing in 2025: A DMARCReport Perspective on Trends, Risks, and Defense

Phishing in 2025: A DMARCReport Perspective on Trends, Risks, and Defense

ByBrad Slavin

Phishing is no longer just a nuisance—it has evolved into one of the most persistent and damaging cybersecurity threats facing organizations today. At DMARCReport, we continuously analyze global email traffic, authentication patterns, and attack vectors to understand how phishing is evolving and what organizations must do to stay protected. What the data shows is clear:…

What are the most common reasons a DMARC DNS record fails to be recognized by receivers?

What are the most common reasons a DMARC DNS record fails to be recognized by receivers?

ByBrad Slavin

Receivers most often fail to recognize a DMARC DNS record because of syntax or tag-value errors (for example, missing v=DMARC1 or invalid p=), wrong DNS type or placement (DMARC must be a TXT at _dmarc.yourdomain), provider UI formatting or TXT-length mishandling, propagation/TTL and negative caching, DNSSEC or delegation problems, invalid or unverified rua/ruf URIs, duplicate/conflicting…

From XML to Insights: How to Read DMARC Reports and Detect Unauthorized Senders

From XML to Insights: How to Read DMARC Reports and Detect Unauthorized Senders

ByBrad Slavin

To read DMARC XML aggregate reports and detect unauthorized senders, you must parse and normalize the RUA schema fields (policy_published, record/row/identifiers/auth_results), correlate SPF/DKIM results with domain alignment and known infrastructure, apply volume/fail-rate/IP-diversity heuristics enriched with DNS/WHOIS/ASN/threat intel, and alert on suspicious patterns while suppressing forwarding artifacts—an end‑to‑end workflow that DMARCReport automates and scales. DMARC aggregate…

Fake Google Security, Beware Qatar Scams, AI Targets LinkedIn

Fake Google Security, Beware Qatar Scams, AI Targets LinkedIn

ByBrad Slavin

Last week was all about the big names that got targeted by threat actors. The attacks look a bit more sophisticated. For instance, cybercrooks have been abusing Google Account security pages to gain access to sensitive data, such as passcodes. Qatar Airways suggests that agents use verified platforms. Australia-based LinkedIn accounts are being easily targeted…

Beyond SPF and DKIM: Why a DMARC Check Matters More Than Ever

Beyond SPF and DKIM: Why a DMARC Check Matters More Than Ever

ByBrad Slavin

A DMARC check matters more than ever because, unlike SPF and DKIM alone, DMARC enforces domain alignment and receiver-enforceable policy (quarantine/reject) with rich reporting that prevents spoofing at scale, restores sender visibility, and measurably improves security and deliverability across complex email ecosystems. Email authentication matured from “can the sender prove they own the IP/key?” (SPF/DKIM)…

No SPF Record Found — What It Means, Why It Matters & How to Fix It

No SPF Record Found — What It Means, Why It Matters & How to Fix It

ByBrad Slavin

In today’s digital world, email remains one of the most widely used communication channels for businesses and individuals alike. From important system alerts to marketing newsletters, email drives essential communication. But this critical channel also attracts malicious actors — and without proper protections in place, your domain can become an easy target for phishing, spoofing,…

Stop Guessing Your DMARC Data — Use a Free Analyzer the Right Way

Stop Guessing Your DMARC Data — Use a Free Analyzer the Right Way

ByBrad Slavin

To stop guessing your DMARC data, configure a free analyzer like DMARCReport with correct RUA/RUF endpoints, tune reporting scope (aggregate vs. forensic), normalize noisy sources, interpret pass/fail and alignment metrics, and roll out policy changes incrementally (none → quarantine → reject) with alerting, automation, and privacy controls. Email authentication only works when you can see…

What Is DMARC Alignment, And How Does It Work

What Is DMARC Alignment, And How Does It Work

ByBrad Slavin

Protecting your email infrastructure doesn’t just mean implementing a few basic authentication protocols. It’s 2026, and email service providers no longer evaluate these protocols in isolation. They understand that spoofing and phishing have become intrinsic to today’s cyber threat landscape, and that these threats are evolving just as fast as legitimate email ecosystems. Attackers are…

How a DMARC Record Stops Phishing and Domain Abuse

How a DMARC Record Stops Phishing and Domain Abuse

ByBrad Slavin

A DMARC record stops phishing and domain abuse by instructing receiving mail servers to reject or quarantine any message that fails SPF or DKIM alignment with your domain and by sending you actionable reports that identify unauthorized sending sources. DMARC (Domain-based Message Authentication, Reporting & Conformance) builds on SPF and DKIM to authenticate who can…

Understanding URL Manipulation & URL Rewriting – A DMARCReport Guide

Understanding URL Manipulation & URL Rewriting – A DMARCReport Guide

ByBrad Slavin

In today’s digital world, almost everything we access online has a web address — a URL (Uniform Resource Locator). These seemingly ordinary strings of text are the doorways to websites, files, apps, cloud dashboards, support pages, videos, and more. But what many people don’t realize is that those URLs can be manipulated — sometimes for…