Cybersecurity threats are on the rise again this week. Hybrid cloud ransomware attacks are becoming more and more frequent. Intruders are now stealing vast amounts of data and wiping out backups without even using traditional malware. Also, government networks in Asia have been targeted in long-running data theft campaigns. On top of all that, a global wave of phishing is hitting people with new malware delivered through fake voicemails and purchase orders. In South Asia, some skilled attackers are expanding their threat space to target Linux systems. And if that’s not enough, a massive healthcare data breach has exposed the personal details of more than 600,000 individuals.
If you’ve ever dealt with email security, chances are you’ve heard of DMARC—short for Domain-based Message Authentication, Reporting & Conformance. But what exactly does it do, and why should you care? Well, imagine your email domain is your digital storefront, bustling with clients and sensitive communications. Without proper email authentication, it’s like leaving your front door wide open to spoofers and phishers who can impersonate your brand, wreak havoc, and tank your email domain reputation.
Migrating to Office 365, or Microsoft 365 as it’s increasingly known, can feel like preparing for a grand adventure through the digital wilderness. You’re trading your familiar desktop-land for the vast expanse of cloud computing — a brave, sometimes bumpy journey.
DMARC alignment basics: Ensuring SPF and DKIM work together
by DuoCircle
DMARC alignment is the final checkpoint that ensures SPF and DKIM are not present for the sake of it, but are actually configured correctly and linked to your sending domain. This is done by verifying that the domain in the email’s visible ‘From’ address matches (or is aligned with) the domains used in SPF and/or DKIM authentication.
Email security is one of the most critical aspects of running a professional and trustworthy business. With cyber threats, phishing attempts, and email spoofing on the rise, ensuring that your organization’s emails are authenticated has never been more important. DomainKeys Identified Mail (DKIM) is a widely used email authentication method that adds a digital signature to your outgoing messages, helping prevent tampering and proving that emails truly come from your domain.
How can real estate companies protect their emails with DMARC?
by DuoCircle
The real estate industry has evolved to be as digitally driven as any other industry, like finance and retail. From property listings to deal closures, everything happens online. Although it has made things a lot easier for the agent, seller, and buyer, this digital shift has also opened doors to cyberattackers.
Cybersecurity threats continue to escalate this week. Apple issued its seventh zero-day fix of 2025 after reports of active exploitation. Hackers are abusing a two-year-old Apache flaw to install hidden back doors that patch themselves to evade detection. A phishing campaign is spreading malware against enterprises worldwide. Authorities renewed sanctions on crypto exchanges that moved over $100 million for ransomware groups and froze another $300 million tied to fraud. At the same time, another malware is exploiting Windows flaws to infiltrate multiple industries.
DMARCbis adoption: what IT leaders, CISOs, and domain owners need to know
by DuoCircle
The stronger and better DMARC2.0 is almost here. This upgraded, tighter version aims to combat the growing menace of email-based phishing and spoofing attacks, especially the ones powered by artificial intelligence.
Email communication remains one of the most essential tools for businesses and individuals alike, but ensuring its authenticity is critical to protecting recipients from phishing and spoofing attacks. One of the key mechanisms for verifying the legitimacy of an email is DomainKeys Identified Mail (DKIM), which uses cryptographic signatures to confirm that messages haven’t been altered in transit and truly originate from the claimed domain.
How can the finance sector leverage DMARC to defend against email fraud?
by DuoCircle
The finance sector thrives on trust. The fact that your clients are putting their hard-earned money in your company or institution shows that they not only have confidence in your financial products or services, but also that they believe you have the ability to keep their assets and data safe. But, truth be told, their money and data aren’t really safe unless you actively protect them.
Email security has become a critical priority for businesses and organizations of all sizes, and DMARC (Domain-based Message Authentication, Reporting, and Conformance) plays a central role in protecting domains from spoofing and phishing attacks. While setting up DMARC ensures that unauthorized messages are flagged or rejected, the real challenge lies in understanding the flood of DMARC XML reports that email providers generate. These reports contain valuable insights into who is sending emails on your behalf, whether they pass authentication checks, and where potential vulnerabilities may exist.
Email remains one of the most vital communication tools for both businesses and individuals, but when outgoing messages fail to send, productivity and reliability take a hit. At the heart of email delivery lies the Simple Mail Transfer Protocol (SMTP) server, which is responsible for relaying messages from your email client to the recipient’s inbox. However, misconfigurations, connectivity problems, or security restrictions can cause SMTP servers to malfunction, leaving users frustrated with undelivered or bounced emails.
Cybersecurity incidents this week include Google completing notifications for a Salesforce breach linked to ShinyHunters, and the discovery of Charon ransomware targeting the Middle East public and aviation sectors with APT-style tactics. Researchers exposed new 2TETRA:2BURST flaws in critical TETRA radio systems, while a WinRAR zero-day was exploited by Paper Werewolf and RomCom groups. The GreedyBear campaign stole over $1 million via malicious browser extensions, alongside an Ethereum trading bot scam using AI-generated YouTube videos to drain wallets of nearly $900,000. Let’s dissect each news in brief!
In today’s digital landscape, email security is more critical than ever. Cybercriminals frequently exploit email systems through spoofing and phishing, making it essential for organizations to adopt robust authentication methods. DomainKeys Identified Mail (DKIM) is one of the core email authentication protocols that helps verify a sender’s identity and ensures that messages are not altered in transit. Implementing DKIM involves publishing a TXT record in your domain’s DNS, which serves as a digital signature for outgoing emails.
How do third-party marketing agencies send emails on behalf of clients while staying
by DuoCircle
It is a common practice for businesses to delegate marketing tasks to third-party agencies. Working with these marketing agencies brings in added benefits such as specialisation in particular niches and cost-effectiveness. These agencies need to take extra care to ensure their emails don’t end up in the spam folder or get rejected.
DMARC policy transition strategies for global banks: Moving to quarantine and reject safely
by DuoCircle
DMARC has now become a non-negotiable for every organization that sends bulk emails on a daily basis. It is even more critical for banks, where the stakes are so high that it’s not merely about money, but also sensitive data of their customers, regulatory compliance, and the integrity of their brand.
Recent cybersecurity incidents underscore growing threats everywhere in healthcare, cloud services, and mobile platforms. A ransomware attack compromised over 113,500 patient records at a cancer centre; meanwhile, critical flaws in AI servers and enterprise security systems exposed risks of credential stealing and remote code execution. Alongside, fake VPN apps on official stores tricked users into fraudulent subscriptions, and a cloud container vulnerability allowed malicious actors to avoid isolation controls. These cases point to the need for prompt patching, stricter access controls, and user vigilance against growing cyber threats.
Sometimes your email just doesn’t reach its recipient. You’ve done everything right— crafted the perfect message, sent it to the correct address, and even authenticated your domain with email authentication protocols. Yet, it gets flagged or doesn’t even land in the receiver’s mailbox.
SPF macros can be best described as placeholders that are used within SPF records. They intend to make the SPF record more flexible and intelligent. This way, you don’t have to hardcode every detail; you can use macros like %{i}, %{d}, and %{h} to allow SPF records to adapt during a live email authentication check.
Using the DMARC reject policy for non email sending domains: A guide
by DuoCircle
You might think that only your active domain (the one that you use to send emails) is vulnerable to spoofing and phishing attacks. But the truth is, there is more than one way that attackers use to intercept your systems, and often they are the ones you least expect. That’s the reality of email-based attacks; they not only exploit your primary, active domain, but also make backdoor entries through non-email-sending domains and parked domains. The reason cybercriminals go after the parked domains, instead of active ones, is that the former are often overlooked. It is easier to think that the attackers might not even pay heed to the inactive ones, but they know that these dormant ones are low-hanging fruit.
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