By Andy Syrewicze, Security Evangelist at Hornetsecurity. Hornetsecurity were finalists in the ‘Security Innovation of the Year (Enterprise)’ category at The 2024/25 Cloud Awards.

Emails are a cornerstone of professional communication.

Yet, many fail to reach recipients due to spam filters or outright rejection—a challenge that grows as providers like Yahoo and Google Mail (Gmail) strengthen their defences against cyber threats. Brand impersonation has emerged as a dominant tactic, causing costly problems for businesses relying on email to drive sales, build trust, and communicate effectively.

Domain-based Message Authentication, Reporting, and Conformance (DMARC) is an authentication protocol that offers a proven solution. By combining SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) authentication, DMARC ensures that emails are legitimate and originate from trusted sources, protecting brands and recipients from phishing and spoofing attempts. Together, these technologies instil confidence in both senders and recipients.

Why DMARC is so important

Undelivered emails have a huge impact: US companies lose $59 billion annually due to deliverability issues, with each undelivered email representing a missed opportunity to engage customers or close sales.

Beyond financial losses, the reputational damage is equally significant. Repeated movement of authentic emails to spam folders erodes trust. According to a survey by an email delivery service, 53% of respondents reported losing confidence in a company when their emails repeatedly landed in spam, and 10% unsubscribed entirely. This isn’t just lost communication – it’s lost revenue and missed opportunities to build customer loyalty.

Ensuring email deliverability is vital for business success, and DMARC excels in providing secure and reliable email authentication—essential for brands aiming to stay out of spam folders.

The challenges of DMARC implementation

DMARC may present functional challenges, especially in implementing and maintaining the complex protocols required for effective email authentication. Misconfigured SPF and DKIM records frequently lead to email authentication failures, leaving businesses struggling to identify the root cause.

Additionally, email providers are constantly tightening filters to counter increasingly sophisticated cyber-attacks. These tightening controls often require certain email authentication settings. While beneficial for users, this strictness means legitimate emails can be flagged as spam. Without the tools to analyse DMARC reports, and to easily view configurations and pinpoint issues, organisations can be left guessing why their emails failed to deliver.

DMARC management tools: the missing link

DMARC management services can solve these challenges, turning what might seem like a labyrinth of technical configurations into a streamlined, manageable process.

By ensuring compliance with authentication standards, they significantly improve the chances that legitimate emails reach their intended recipients. Through detailed reporting, DMARC Managers provide clear, actionable insights that highlight issues such as unauthorised email use, enabling organisations to address these proactively. Additionally, DMARC Managers can detect and block unauthorised use of domains, protecting brands from phishing and spoofing attempts.

For organisations managing multiple domains, DMARC management tools offer a centralised platform that ensures consistency and security across all email systems. They also enhance brand protection through Brand Indicators for Message Identification (BIMI), allowing businesses to display their logos directly in recipients’ inboxes. This not only boosts brand visibility and trust but also provides a competitive edge in email marketing efforts, ultimately improving the effectiveness and reach of bulk email campaigns.

In a world where trust is currency and communication is key, DMARC managers are essential allies. They simplify email authentication, safeguard domains, and ensure that brands’ messages are seen – not lost in spam filters or hijacked by malicious actors.