Email is still the most exploited initial vector of attacks in cybersecurity. Phishing is still considered the number one initial access vector in breach investigations, and at the core of all phishing attacks is domain spoofing. (more…)
This step-by-step guide explains how to prepare your Microsoft 365 tenant and custom domain to publish a DKIM record, locate your Microsoft-managed DKIM key hostnames, and understand how DomainKeys Identified Mail works under the hood. You will learn how DKIM’s email authentication model uses a cryptographic signature based on a public key and private key pair to protect email messages as they traverse SMTP, and how Microsoft 365 implements selectors to support safe key rotation.
Email-centric threats continue to be a prevalent and expensive cybersecurity challenge for both companies and individuals. With phishing methods evolving in complexity, businesses are turning to advanced security solutions to spot and prevent harmful emails from landing in their mailboxes.
![AI Phishing Campaign, TikTok Phishing Targeted, Dutch Police Cyberattack – Cybersecurity News [March 23, 2026]](https://www.duocircle.com/wp-content/uploads/2026/03/spf-permerror-5600-1.jpg)
Here are the top cyber incidents from last week that kept the cybersecurity professionals on their toes. A highly sophisticated AI-powered phishing campaign is targeting hundreds of thousands of businesses worldwide. Meanwhile, TikTok business profiles are on the radar of cybercriminals. In a shocking turn of events, the Dutch Police became the victim of a threat attack. Also, authorities were forced to shut down a school in Southampton after a cyberattack.
In the retail industry, building a bond of trust with your clients is of utmost importance, but what happens when the very channel used to build this trust is itself compromised?
![Horabot Resurfaces Mexico, Aura Breach Compromise, Tax Season Threats – Cybersecurity News [March 16, 2026]](https://www.duocircle.com/wp-content/uploads/2026/03/spf-record-7898.jpg)
Here are some of the biggest head turners from last week’s cybersecurity landscape. While the Horabot banking malware has re-entered Mexico, the Aura data breach exposed a whopping 900,000 customers to potential threats. Meanwhile, cyber incidents are surging because of the ongoing tax season. A new malware, “DarkSword,” is giving nightmares to iPhone users across the globe.
Displaying your brand logo in the inbox is becoming an important part of email trust and recognition. With BIMI, businesses can make their emails more identifiable, but this requires choosing the right certificate. This is where VMC and CMC come in. While both allow your logo to appear in supported inboxes, they differ in terms of requirements, cost, and the level of trust they offer.
![Cambodia Targets Cybercriminals, Traditional Security Insufficient, AI Against Phishing – Cybersecurity News [March 09, 2026]](https://www.duocircle.com/wp-content/uploads/2026/03/spf-record-5023.jpg)
Last week’s cyber incidents revolved mainly around stepping up the security setups to combat cyber mishaps. Cambodia has recently approved a draft to tackle cybercrime syndicates. Advanced phishing scams are forcing organizations to amp up their security systems. Smartphone users are relying on AI to keep cyber scams at bay.
Email authentication is vital for safeguarding your domain against spoofing and enhancing email deliverability. A significant aspect of this is DKIM (DomainKeys Identified Mail), which ensures that an email remains unchanged during transmission. However, issues like incorrect DNS records, misconfigured selectors, or absent signatures can lead to DKIM validation failures.
Email authentication plays a critical role in protecting your domain from spoofing and ensuring that your messages reach recipients’ inboxes. When DKIM signatures fail, it can lead to delivery issues, spam folder placement, or even rejected emails.
Self-hosted email gives you control, privacy, and the flexibility to run open source software instead of relying entirely on a mail service provider. Whether you build on a modest cloud server or on-prem hardware, the secret to staying out of the junk folder is deliberate planning: clean IP reputation, disciplined DNS configuration, a correctly tuned SMTP server and IMAP server, and strong transport security with TLS certificates.
Email and web security were never really a pressing concern for many organizations in the UK until 2017, when the National Cyber Security Centre introduced Mail Check and Web Check as part of its Active Cyber Defence programme. At that time, most teams had limited visibility into how their domains were configured, how secure their websites were, or whether their email infrastructure was operating properly.
![LastPass Users Phished, Amazon Down US, UK Cybersecurity Boost – Cybersecurity News [March 02, 2026]](https://www.duocircle.com/wp-content/uploads/2026/03/email-smtp-service-6670.jpg)
Here are the top four cybersecurity news stories from this week that you should be aware of. LastPass users have been targeted by threat actors, while US Amazon users experienced a massive outage this Thursday. The NCSC has urged UK enterprises to strengthen their cybersecurity systems. Meanwhile, Europol has managed to disrupt the notorious Tycoon 2FA phishing gang.
Email authentication has moved far beyond a technical checkbox. In 2026, mailbox providers expect domains to actively enforce authentication policies to prevent spoofing and phishing. This is where DMARC policies become critical, especially the p=quarantine setting.
A mail relay server is the SMTP-facing component that accepts, routes, and forwards messages under the simple mail transfer protocol. In practice, an smtp server acting as a relay server moves electronic letters (digital mail) from senders to the recipient’s smtp server, often using a smart host to aggregate and optimize outgoing email.
Most scraping failures are predictable once you measure the right things. Marketing and business teams want reliable acquisition from product pages, search results, and reviews, yet too many pipelines rely on trial and error. A practical strategy uses verifiable signals about browsers, networks, and page behavior so you can tune scrapers with confidence, not guesswork.
Improperly authenticated emails can leave your domain susceptible to issues such as spoofing, phishing, and undelivered messages, often without your awareness. Conducting a Domain-based Message Authentication, Reporting, and Conformance (DMARC) assessment is essential to uncover security vulnerabilities that malicious actors may take advantage of, and it helps ensure that your email system is adequately secured.
Email remains an essential communication channel for businesses worldwide, playing a critical role in marketing, customer engagement, and internal collaboration. Despite the rise of instant messaging and social media platforms, email continues to be the backbone of professional communication, handling over 300 billion messages daily as of 2023. However, the mechanics behind reliable email delivery are complex and involve multiple operational layers. Ensuring that an email arrives promptly, intact, and securely requires a deep understanding of protocols, infrastructure, and cybersecurity measures.
Your website is the place prospects decide whether you feel credible, customers decide whether you feel current, and partners decide whether you feel easy to work with. If publishing a new page still requires a ticket, a developer handoff, and a quiet prayer that nothing breaks, your CMS is charging you interest every week.
Email security threats continue to evolve, making strong authentication more important than ever. One of the most effective ways to protect your domain from spoofing and phishing attacks is by implementing DomainKeys Identified Mail (DKIM). By adding a DKIM record in your DNS, you create a digital signature that verifies your outgoing emails are genuinely sent from your domain and have not been altered in transit.