What happens when you misconfigure DKIM for your domain?
by DuoCircle
Your outgoing emails are only as safe as the configuration of your authentication protocols, like DKIM or DomainKeys Identified Mail. We say this because your emails are not inherently secure, which means anyone can intercept your outgoing emails and try to alter or impersonate them before they reach your recipients. This happens when you have not implemented DKIM at all or configured it incorrectly.
When I first started managing email campaigns, I spent hours crafting individual messages, manually segmenting lists, and tracking responses. This process was no walk in the park and left little to no room for strategic planning.
DomainKeys Identified Mail (DKIM) is a critical component of modern email authentication frameworks. As email threats such as phishing and spoofing continue to increase, leveraging a DKIM signature checker has become indispensable for organizations aiming to protect their domain reputation and ensure email deliverability.
Sender Policy Framework (SPF) records are an essential component of email authentication strategies designed to mitigate email spoofing and improve email security. These DNS TXT records specify which email servers are authorized to send outgoing email on behalf of your email domain.
Ensuring robust email security has become a pivotal concern for domain owners and organizations worldwide. Email threats such as phishing, spoofing attacks, and fraud are increasingly sophisticated, making proper email authentication protocols critical. Domain-based Message Authentication, Reporting & Conformance (DMARC) stands as a frontline defense mechanism, empowering organizations to protect their domains from email spoofing and improve overall email deliverability.
This week saw a surge in major cyber incidents worldwide. A ransomware attack crippled Japan’s Askul retail network, Qilin claimed Habib Bank AG Zurich, and Google uncovered AI-powered malware that rewrites its code. Cisco issued urgent fixes for firewall exploits, while Oglethorpe and NMHC disclosed healthcare data breaches.
How does BIMI complete the email authentication story?
by DuoCircle
Your emails are not inherently secure. This means when you send emails to your clients, there’s nothing in the default email protocol that guarantees the message actually came from you or wasn’t manipulated along its way.
As organizations continue to embrace the cloud, migrating to Microsoft 365 and Office 365 ecosystems has become a priority for seamless collaboration, enhanced security, and productivity. Office 365 migration involves transferring existing data—including emails, calendars, files, and user accounts—from legacy platforms or earlier Microsoft versions to cloud-based Microsoft 365 services such as Microsoft Teams, OneDrive, and SharePoint. This data migration process is critical for businesses aiming to leverage the extensive capabilities of Microsoft 365 apps like Outlook, Excel, and PowerPoint, while minimizing downtime and data loss.
In today’s fast-paced digital landscape, businesses must leverage efficient IT operations to stay competitive and responsive to market demands. Managed services have emerged as a strategic approach to outsourcing critical IT functions to specialized managed service providers (MSPs). This model empowers organizations to focus on core business objectives while ensuring robust IT infrastructure management, proactive IT strategy, and seamless service delivery.
DNS spoofing explained: what it is, how it works, and how to mitigate it
by DuoCircle
When your customers or clients type your website in the address bar, the internet does not recognize it as “yourcompany.com”; it actually looks for the numerical IP address that corresponds to that name. This happens through the Domain Name System (DNS), which is essentially like a directory of the internet.
DomainKeys Identified Mail (DKIM) stands as a pivotal technology within modern email authentication protocols, providing a robust mechanism for verifying the legitimacy of email messages. By enabling the signer—the sender’s authorized mail agent—to affix a cryptographic signature to emails, DKIM significantly improves email security and trustworthiness. The core premise involves associating a cryptographic signature with the signing domain, which recipients and verifiers can subsequently validate against a published public key in the Domain Name System (DNS).
This week’s cybersecurity highlights include a Chrome zero-day exploited by Memento Labs for spyware attacks, new npm supply chain threats like PhantomRaven and an info-stealer campaign, and active exploitation of DELMIA Apriso and XWiki flaws. Meanwhile, ransomware hit Sedgebrook and Heartland Health Center, exposing patient data and prompting renewed healthcare security concerns.
Email server hosting is a vital component of modern organizational communication infrastructure, providing companies with the platforms necessary to send, receive, and store emails securely and efficiently. At its core, email hosting involves deploying mail servers that operate using standard email protocols such as SMTP (Simple Mail Transfer Protocol), IMAP (Internet Message Access Protocol), and POP3 (Post Office Protocol version 3). These protocols orchestrate the flow of messages between email clients and servers, ensuring timely delivery and synchronization across devices.
How can CAA records strengthen BIMI implementation
by DuoCircle
When the digital landscape is already flooded with fake and fraudulent emails, proving your legitimacy is essential but also very challenging. While you might be creating an email to send out to your clients, a group of cyberattackers might have already crafted and launched a phishing campaign that looks like it came from your brand.
The Simple Mail Transfer Protocol (SMTP) is the foundational email protocol responsible for the reliable delivery of outbound email across the internet. Pioneered by Ray Tomlinson, SMTP governs the communication between email clients and email servers—or between servers themselves—in the process known as the SMTP session. In this session, the SMTP client initiates a connection to an SMTP daemon running on the outgoing mail server, typically on an SMTP port such as port 25, port 587, or port 465.
Configuring SPF, DKIM, and DMARC for Loops.so: A guide
by DuoCircle
Sending out email campaigns isn’t just about crafting nice-looking emails; they should also be authenticated and secure. So, whether you are sending these emails directly from your mailbox or using an external email platform like Loops, you need to ensure that the receiving servers trust your emails and that they are delivered securely to the recipient’s inbox.
The Sender Policy Framework (SPF) is a critical component of contemporary email authentication strategies aimed at combatting email spoofing and enhancing email fraud prevention. SPF functions by enabling domain owners to specify, through DNS TXT records, the mail servers authorized to send emails on their behalf. This specification is embedded in the SPF record syntax, which is implemented within DNS records and interpreted by receiving mail servers during an SPF check.
Cyber threats kept security teams busy this week. A new campaign called PassiveNeuron is spying on government and industry networks across several regions, while the Jingle Thief group is running cloud-based gift card scams.Hackers are also exploiting the SessionReaper bug in Adobe Commerce, and a critical Lanscope flaw has been flagged by CISA. In healthcare, a breach at Conduent exposed personal data from 462,000 Blue Cross Blue Shield members, underscoring how widespread and damaging these attacks have become. Here are the latest updates from this past week.
Shop till you drop while staying protected from scams this Black Friday
by DuoCircle
The Black Friday week is undeniably the best time to shop, grab great deals, and perhaps save a few bucks. But this is only until you lose more than you bargained for; your personal data, payment details, or even your hard-earned money, to a well-crafted cyber attack.
![Askul Ransomware Disruption, Qilin Targets Habib, Google Exposes Malware – Cybersecurity News [November 03, 2025]](https://www.duocircle.com/wp-content/uploads/2025/11/spf-record-5602.jpg)
![Chrome Spyware Exploited, npm InfoStealer Attack, DELMIA XWiki Vulnerabilities – Cybersecurity News [October 27, 2025]](https://www.duocircle.com/wp-content/uploads/2025/11/spf-record-tester-6780.jpg)
![Silent PassiveNeuron Attacks, Jingle Thief Fraud, SessionReaper Adobe Exploit – Cybersecurity News [October 20, 2025]](https://www.duocircle.com/wp-content/uploads/2025/10/spf-validator-7800.jpg)
