VMC vs CMC explained: Which logo certificate should you choose?
by DuoCircle
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]
by DuoCircle
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.
NCSC announces the retirement of Mail Check and Web Check: Here’s what it really means
by DuoCircle
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]
by DuoCircle
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.
What is DMARC quarantine? Understanding the p=quarantine policy in 2026
by DuoCircle
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.
What mail relay servers are, why they’re targeted, and the risks of misconfiguration
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.
![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)
![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)
