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Practical guidance on SPF, DKIM, DMARC, BIMI, phishing protection, and the parts of email infrastructure that quietly break things. Written by the DuoCircle team for people who run email and want to stop getting paged.
BIMI confuses buyers because two different vendors handle two different jobs. Here is the clean split between VMC procurement (a Certificate Authority function) and BIMI hosting (what your DMARC reporting tool actually does).
The SPF 10-DNS-lookup limit silently breaks email authentication once you exceed it. Here is how to diagnose a permerror, why even careful organizations end up over the limit, and the fix options that actually work.
Your scan-to-email died after a Microsoft 365 update. Here's why basic auth and SMTP AUTH got disabled, the three options your IT team actually has, and the fastest reliable fix.
Publishing a DMARC record at p=none is the starting line, not the finish line. Here is what p=none actually does, what it does not, and how to move to enforcement without breaking legitimate mail.
Here’s your weekly roundup of the most significant cybersecurity stories from the past week, covering major data breaches, critical vulnerabilities.
Email is one of the most critical communication channels for SaaS companies.
A data-driven analysis with 20+ statistics from Verizon, IBM, Cisco, KPMG, LayerX, Microsoft, the World Economic Forum, and others.
In today’s digital landscape, especially within hybrid cloud frameworks, email authentication has become increasingly vital.
Why DIY-ing DMARC could cost you more than you think.
Email remains an essential communication tool for businesses, utilized for everything from transactional notifications to marketing initiatives and customer.
A data-driven analysis with 20+ statistics from EasyDMARC, Google, Microsoft, IBM, Verizon, CISA, and the PCI Security Standards Council.
Organizations that send large volumes of emails, including software-as-a-service (SaaS) platforms, marketing automation providers.
A data-driven analysis for security leaders, IT teams, and MSPs — with 20+ primary-source statistics from Microsoft, IBM, FBI IC3, KnowBe4, Verizon, Cisco.
Sri Lanka Cyberattack, SilentGlass Threat Defense, Rituals Data Breach – Cybersecurity News [April 20.
Transitioning from a Windows-based SMTP server to a cloud-hosted solution has evolved beyond simple modernization; it’s now a key strategic initiative aimed at.
Email trust is no longer a background technical detail—it’s the foundation of how brands communicate, protect users.
Why these DKIM record examples matter A well-formed DKIM record is the foundation of email authentication.
UK Cyber Surge, Poland Incident Surge, Japan Shipping Attack – Cybersecurity News [April 13.
When your organization operates at scale, emails don’t go out from one domain; they are sent from marketing platforms, HR systems, finance tools.
Every verified email has an unseen signature that plays a crucial role in establishing trust.
In the fast-moving digital world of today, effective email delivery is essential for businesses that rely on smooth communication and customer interactions.
As email security continues to advance, the inbox serves as a crucial entry point, with DKIM testing playing an essential role in its protection.
Apple Pay Scam, Crypto Fraud Victims, Retirement Phishing Loss – Cybersecurity News [April 06.
How ARC resolves email authentication for forwarded messages.
The Sender Policy Framework is deceptively simple: publish a single SPF record as a TXT record in your domain DNS so receiving systems can check whether a.
Selecting the appropriate hosted SMTP server in 2026 is crucial for getting your emails delivered to the inbox rather than the spam folder.
In the bustling digital environment of today, the quest for consumer attention often starts with the inbox.
LinkedIn Fraud Spike, SIM Scam Bust, UK VIPs Targeted – Cybersecurity News [March 30.
Navigating email authentication can often feel overwhelming, particularly when it comes to DKIM validation and ensuring your emails reach their intended.
What happens when your DKIM key is compromised? How can you identify and fix the problem?
Email is still the most exploited initial vector of attacks in cybersecurity.
This step-by-step guide explains how to prepare your Microsoft 365 tenant and custom domain to publish a DKIM record.
Email-centric threats continue to be a prevalent and expensive cybersecurity challenge for both companies and individuals.
AI Phishing Campaign, TikTok Phishing Targeted, Dutch Police Cyberattack – Cybersecurity News [March 23.
Why is DMARC important for the retail sector?
Horabot Resurfaces Mexico, Aura Breach Compromise, Tax Season Threats – Cybersecurity News [March 16.
VMC vs CMC explained: Which logo certificate should you choose?
Cambodia Targets Cybercriminals, Traditional Security Insufficient, AI Against Phishing – Cybersecurity News [March 09.
Email authentication is vital for safeguarding your domain against spoofing and enhancing email deliverability.
Email authentication plays a critical role in protecting your domain from spoofing and ensuring that your messages reach recipients’ inboxes.
Self-hosted email gives you control, privacy, and the flexibility to run open source software instead of relying entirely on a mail service provider.
NCSC announces the retirement of Mail Check and Web Check: Here’s what it really means.
LastPass Users Phished, Amazon Down US, UK Cybersecurity Boost – Cybersecurity News [March 02.
Email authentication has moved far beyond a technical checkbox. In 2026, mailbox providers expect domains to actively enforce authentication policies to pr.
What mail relay servers are, why they’re targeted, and the risks of misconfiguration A mail relay server is the SMTP-facing component that accepts, routes.
Most scraping failures are predictable once you measure the right things.
Improperly authenticated emails can leave your domain susceptible to issues such as spoofing, phishing, and undelivered messages, often without your awareness.
Understanding the Email Delivery Ecosystem Email remains an essential communication channel for businesses worldwide, playing a critical role in marketing.
Your website is the place prospects decide whether you feel credible, customers decide whether you feel current.
Email security threats continue to evolve, making strong authentication more important than ever.
UFP Cyber Compromise, Marseille Ticket Breach, Google Phishing Campaign – Cybersecurity News [February 23.
Deploying DMARC the right way: Here’s what MSPs and enterprises should know.
When a DMARC failure hits production, act methodically.
Business email compromise remains one of the most costly advanced threats because it exploits trust, targets finance workflows.
Email spoofing and phishing attacks continue to target businesses of all sizes, making domain protection more critical than ever.
Amazon AI Cyberattack, Odido Data Breach, German Rail Targeted – Cybersecurity News [February 16.
DMARC is now mandatory for Cyber Essentials Mark Certification from CSA.
SMTP deliverability monitoring acts as an essential support system that assesses where your emails end up whether in the inbox, spam folder.
Email authentication is critical to protecting your domain from spoofing, phishing.
Email remains the primary attack vector for phishing and business email compromise, making DMARC a critical layer of protection for modern organizations.
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