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).
![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)
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.
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.
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.
![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)
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.
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.