In the realm of electronic communications, an email server is a critical component responsible for sending, receiving, and storing emails. At the core of email transmission lies the Simple Mail Transfer Protocol (SMTP), an essential set of rules that govern how outbound mail servers relay messages efficiently and securely. Within this infrastructure, the mail transfer agent (MTA) functions as the backbone, managing the routing and delivery of email through SMTP relays.
DomainKeys Identified Mail (DKIM) stands as a crucial pillar of email authentication and security. Defined under RFC 6376, DKIM is an email protocol that uses cryptography to sign email messages with a private key after leaving the mail client or mail server, specifically the mail transfer agent (MTA). The cryptographic signature included in the email headers enables receiving mail servers to perform signature verification by retrieving the corresponding public key from a DNS TXT record associated with the sender’s email domain.
Think of brands like Samsung, eBay, Amazon, and Hulu. These brands are undoubtedly some of the biggest names in their respective industries and have been around for years, which means you can easily trust them with your personal information and data without a second thought.
Email relay services play a pivotal role in facilitating seamless email delivery within modern business communication frameworks. At their core, these services function as intermediaries—SMTP relays—that channel outbound email messages from a sender’s email client or mail server to the recipient’s mailbox provider via a secure pathway. Acting as advanced mail transfer agents (MTAs), email relay services manage complex email routing, ensuring that emails pass efficiently through various email gateways and SMTP servers.
This week brought a wave of innovative and large-scale cyberattacks. Scammers abused social media ads with AI features to push harmful links, with hundreds of accounts posting thousands of scams. More than 100 compromised government email accounts were used in a global phishing campaign against embassies and international organisations. At least 65 servers were hijacked to manipulate Google search rankings, while new backdoors turned email into a data theft tool. Attackers also exploited a Microsoft-signed driver to shut down security defences and install malware. These incidents highlight how quickly trusted platforms and tools can be weaponized, emphasizing the critical need for robust email security measures.
DMARC for GDPR and data privacy compliance: Why email authentication matters for protecting PII?
by DuoCircle
When it comes to data privacy, the GDPR is clear about its goal: it wants organizations to protect personally identifiable information (PII) at every stage of processing and communication. And as you already know, DMARC is a mailbox gatekeeper that authenticates emails and prevents threat actors from misusing your domain.
In today’s fast-paced digital landscape, managed service providers (MSPs) are constantly searching for new ways to expand their offerings and increase profitability. One of the most effective strategies gaining traction is partnering with MSP reseller programs. These programs allow MSPs to broaden their service portfolio, strengthen client relationships, and unlock fresh revenue streams without the heavy costs of developing new solutions in-house. Whether you’re a growing IT business or an established provider, understanding how MSP reseller programs work—and how to leverage them—can be a game-changer for sustainable growth.
If you’ve ever sent a carefully crafted email campaign through SendGrid, only to find it lurking in some unlucky recipient’s spam folder, you know that email deliverability is more art than science—and a little bit of magic. Well, unlike sorcery, improving your email’s chances of landing squarely in the inbox is absolutely doable with a simple, yet powerful tool: the Sender Policy Framework (SPF).
Understanding all the elements of a valid DMARC record
by DuoCircle
DMARC prevents threat actors from impersonating you or someone from your organization and sending spoofed emails on your behalf. However, it’s not easy to set up, manage, and adjust DMARC to ensure this prevention. One of the challenging aspects of DMARC is understanding the syntax and its use case scenarios; otherwise, your DMARC record can run into errors.
Setting up a robust and reliable Windows email server can feel like deciphering an ancient scroll written by Roy Fielding himself — packed with cryptic protocols and obscure configurations. Yet, with the right guidance, configuring these servers transitions from hair-pulling chaos to an empowering exercise in email mastery.
![AI Spreads Malware, Diplomats Phished Globally, GhostRedirector Exploits Servers – Cybersecurity News [September 01, 2025]](https://www.duocircle.com/wp-content/uploads/2025/09/sender-policy-framework-5670.jpg)
