Email spam is a problem. While overall numbers have been dropping, Securelist reported that in Q2 2015, more than 50 percent of all email traffic came from spammers. What’s more, malicious actors have changed tactics to focus on the next generation of tech-savvy consumers: Rather than looking for bank details or personal information, new phishing emails target social connections while malware-carrying attachments are camouflaged to look like antivirus or OS updates. But advancements in detection, particularly the DMARC protocol, have the potential to send spam packing.

Spam Has an Easy Way In

As noted by CSO Online, one of the easiest ways for attackers to convince victims their emails are genuine is by spoofing the sender address. If users believe the message really is from Microsoft, their antivirus company or a trusted friend, they’re far more likely to open, read and even download an attachment. And once attackers have access to a user’s system, they can both send emails from an infected account and use contact list data to spoof a whole new set of addresses.

While early spam-detection efforts focused on message content or relied on users to self-identify bad emails, attackers have quickly graduated to a new level of sophistication by lifting company logos, including working phone numbers and generally brushing up on their grammar. The result? Fake and legitimate messages look and sound almost identical.


Fortunately, Google and Yahoo have a plan: the Domain-based Message Authentication, Reporting and Conformance (DMARC) protocol. According to Threatpost, DMARC takes a hard line against email spoofing by checking all messages against both Domain Keys Identified Mail (DKIM) and Sender Policy Framework (SPF) validation systems.

DKIM relies on a wrapped cryptographic signature to verify the sender domain, while SPF lets senders specify which hosts are able to carry their messages, making spoofed emails easy to identify. In combination, the DMARC protocol makes it almost impossible for spam to slip through — if both the DKIM and SPF checks aren’t successful, the message is quarantined.

Under the new DMARC system, senders can provide information to recipients on what they can do if legitimate emails aren’t getting through, while recipients can send feedback to senders letting them know why their messages were flagged. Yahoo is set to implement the protocol for its and services by Nov. 2, 2015, while Google says it’s moving to a “strict” DMARC policy by June of next year.

While it’s unlikely that even DMARC can completely eliminate spam, it’s a step in the right direction; make spoofing messages hard enough for attackers and they’ll start looking somewhere else. Even with DMARC up and running, however, users can’t get overconfident: Better safe than spoofed.

More from

Despite Tech Layoffs, Cybersecurity Positions are Hiring

4 min read - It’s easy to read today’s headlines and think that now isn’t the best time to look for a job in the tech industry. However, that’s not necessarily true. When you read deeper into the stories and numbers, cybersecurity positions are still very much in demand. Cybersecurity professionals are landing jobs every day, and IT professionals from other roles may be able to transfer their skills into cybersecurity relatively easily. As cybersecurity continues to remain a top business priority, organizations will…

4 min read

How I Got Started: White Hat Hacker

3 min read - White hat hackers serve as a crucial line of cyber defense, working to identify and mitigate potential threats before malicious actors can exploit them. These ethical hackers harness their skills to assess the security of networks and systems, ultimately helping organizations bolster their digital defenses. But what drives someone to pursue a career as a white hat hacker, and how do you get started in leveraging so-called “evil” skills for the greater good?? In this exclusive Q&A, we spoke with…

3 min read

Heads Up CEO! Cyber Risk Influences Company Credit Ratings

4 min read - More than ever, cybersecurity strategy is a core part of business strategy. For example, a company’s cyber risk can directly impact its credit rating. Credit rating agencies continuously strive to gain a better understanding of the risks that companies face. Today, those agencies increasingly incorporate cybersecurity into their credit assessments. This allows agencies to evaluate a company’s capacity to repay borrowed funds by factoring in the risk of cyberattacks. Getting Hacked Impacts Credit Scoring As per the Wall Street Journal…

4 min read

Zombie APIs are a Top Security Concern as API Attacks Surge 400%

4 min read - Organizations of all sizes rely on application programming interfaces (APIs). The API explosion has been driven by several factors, including cloud computing, demand for mobile/web applications, microservices architecture and the API economy as a business model. APIs enable developers to access data remotely, integrate with other services, build modular applications and monetize their data/services. For enterprises that participated in a recent research study, the average number of APIs per organization was 15,564. Large enterprises (over 10,000 employees) had an average…

4 min read