When you forward an email, it might look like the message is simply being passed along to the recipient, as it is. You and your reader will see it as unaffected, but to the receiving server, it can appear very different.
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 connecting mail server is an authorized server to send on your behalf.
Selecting the appropriate hosted SMTP server in 2026 is crucial for getting your emails delivered to the inbox rather than the spam folder. As authentication requirements become more stringent, sender reputation systems change, and competition for visibility intensifies, companies require dependable SMTP services that focus on deliverability, security, and scalability.
In the bustling digital environment of today, the quest for consumer attention often starts with the inbox. Companies are no longer merely dispatching emails; they are vying for the chance to be opened, read, and engaged with. This is where robust SMTP email hosting plays a crucial role, guaranteeing that your messages reach their destination quickly, dependably, and effectively.
![LinkedIn Fraud Spike, SIM Scam Bust, UK VIPs Targeted – Cybersecurity News [March 30, 2026]](https://www.duocircle.com/wp-content/uploads/2026/04/spf-permerror-5622.jpg)
This edition covers all the major cyber incidents of recent times that every cybersecurity enthusiast must be aware of. 1.3 million LinkedIn users are at risk of cyber scams. 600+ illegally routed Indian SIM cards have been nabbed in Cambodia, which otherwise would have been used to carry out malicious cyber scams. High-profile individuals are at risk of social engineering attacks via WhatsApp and Signal. Meanwhile, it has become way too easy for cybercrooks to target elderly people by using artificial intelligence.
Navigating email authentication can often feel overwhelming, particularly when it comes to DKIM validation and ensuring your emails reach their intended destination: the inbox. Whether you’re in marketing, IT, or running a business, becoming proficient with your DKIM validator is more than just a technical necessity; it’s a significant edge over the competition. A single error in configuration could adversely affect your email deliverability, tarnish your sender reputation, and leave your domain vulnerable to spoofing.
As you might already know, DKIM protects your outgoing emails from being tampered with while they are on their way to the recipient’s inboxes. It does this by attaching a digital signature to your outgoing emails. When receiving servers get those emails, they verify that signature using the public key published in your DNS.
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.