How to Build a Scalable DMARC Managed Service

For many years, organizations viewed DMARC as an optional layer of email security. That has changed as mailbox providers, industry regulations, and customer expectations increasingly require stronger email authentication.

Today, businesses need ongoing visibility into who is sending emails on their behalf, whether authentication is configured correctly, and how to prevent domain impersonation and phishing attacks. These requirements have created a growing demand for managed email authentication services rather than one-time implementations.

For service providers, this presents an opportunity to build a recurring security offering that helps clients improve email security, strengthen compliance efforts, protect their domains, and maintain email deliverability over time.

In this guide, you’ll learn how to build, deploy, and manage a scalable DMARC service, avoid common implementation challenges, and create a recurring email security offering for your clients.

Why Managed DMARC Services Are in Growing Demand

At its core, DMARC helps organizations prevent unauthorized parties from sending emails that appear to come from their domains. It works alongside SPF and DKIM to verify sender identity and tells receiving mail servers how to handle messages that fail authentication checks.

While the technical benefits are important, MSPs should also understand the following business impact:

Email-Based Threats Continue to Grow

Email remains one of the most common entry points for cyberattacks.

According to APWG, cybercriminals launched approximately 3.8 million phishing attacks in 2025. At the same time, Barracuda’s 2026 Email Threat Report found that one in three email messages is now either malicious or unwanted spam, underscoring the scale of the threat facing organizations today.

For managed security providers, these numbers matter because domain impersonation frequently serves as the starting point for phishing campaigns, payment fraud, executive impersonation attacks, and credential theft. This is one of the main reasons why email security for managed security providers is essential for client protection as well.

Deliverability is Becoming a Security Issue

Email authentication is no longer only about security; major mailbox providers increasingly expect organizations to authenticate outbound email. Businesses that fail to do so may experience deliverability issues, reduced sender trust, and increased spam placement.

For clients that rely on email marketing, customer communications, invoicing, or support workflows, poor authentication can directly impact revenue and customer experience. Needless to mention that helping customers maintain proper authentication allows MSPs to protect both security and business operations.

DMARC Creates Ongoing Service Opportunities

Unlike many security projects that end after deployment, DMARC requires continuous management. New SaaS applications, marketing platforms, CRM systems, helpdesk tools, and third-party vendors are constantly introduced into customer environments.

Every new sender has the potential to create authentication issues. This makes DMARC an ideal recurring service that delivers long-term value and generates predictable revenue for managed security providers.

Why Organizations Need Stronger Email Authentication

The following frameworks, regulations, and industry requirements are some of the biggest reasons why organizations are paying closer attention to email security and domain protection.

Compliance Requirements Continue to Expand

Many businesses now have to meet stricter security requirements, either because of industry regulations, customer demands, or cyber insurance policies.

• ISO 27001 helps companies find and reduce security risks. Since many cyberattacks start with email, protecting business domains from fake emails can support these efforts.

• SOC 2 requires companies to show that they have strong security practices in place. Protecting domains from phishing and spoofing helps organizations better protect customer data and build trust.

• Companies that process card payments must follow PCI DSS 4.0. Since phishing attacks are often used to steal login details and sensitive information, strong email security can help lower this risk.

• For healthcare organizations, HIPAA focuses on keeping patient information safe. Preventing fake emails that pretend to come from trusted healthcare organizations can help protect both staff and patients.

• In Europe, NIS2 is pushing organizations to take cybersecurity more seriously. It encourages businesses to strengthen their security and reduce risks before they turn into real incidents.

Even if a company doesn’t have to follow a compliance standard, customers and business partners still want to know that their data is safe. Efficient email security helps build trust and shows that the company takes security seriously.

These frameworks may not directly require DMARC, but they all encourage stronger protection against phishing and fake emails. DMARC helps companies do exactly that.

Auditors Are Looking Beyond Traditional Security Controls

A few years ago, security audits mainly focused on things like firewalls, antivirus software, and software updates. Today, they are also looking at how companies protect user accounts and prevent phishing attacks. They want to know what steps organizations are taking to stop attackers from pretending to be trusted people or brands.

This is important because many cyberattacks now target people instead of systems. Even a well-protected company can be at risk if an employee trusts a fake email and clicks on the wrong link. So, companies that use email authentication and protect their domains from spoofing can often show stronger security during audits and customer reviews.

Cyber Insurance Providers Are Asking Tougher Questions

Getting cyber insurance has become more difficult in recent years. Insurance providers now ask more questions about how organizations protect themselves from phishing, email fraud, and account takeovers. They also want to know whether security measures like multi-factor authentication and employee training are in place.

This gives MSPs a chance to show the value of DMARC. It helps clients prove that they are taking steps to protect their business from email-based threats and reduce security risks.

High-Profile Breaches Continue to Highlight Identity Risks

Many major cyberattacks don’t start with advanced hacking tools. They start with a simple email, message, or phone call that tricks someone into trusting the attacker. That’s why protecting identities has become just as important as protecting devices and networks.

Attackers often pretend to be company executives, vendors, business partners, or well-known brands because it is easier to trick people than break through security systems. DMARC helps stop this type of attack by making it harder for cybercriminals to send fake emails from a trusted domain. This helps organizations protect both their systems and their reputation.

Turning DMARC Into a Recurring Revenue Service

Many service providers see DMARC as just another security tool.

But here is how it can also be a valuable service that helps grow revenue, strengthen client relationships, and open the door to larger security projects:

Most Clients Already Need DMARC

One of the biggest advantages of DMARC is that MSPs don’t need to convince clients that the problem exists. Almost every organization uses email to communicate with customers, employees, and partners. Most also own one or more domains and use different platforms to send emails.

At the same time, phishing, spoofing, and email fraud continue to be major threats. This means DMARC solves a problem that many clients already have, making it easier to introduce as a service.

DMARC Creates Ongoing Revenue Opportunities

Setting up DMARC is only the beginning. As businesses adopt new tools and services, their email environment continues to change. New sending platforms may need to be added, authentication issues can appear, and policies often need regular review.

Many clients need ongoing help with monitoring, troubleshooting, reporting, and managing their DMARC setup. This gives MSPs an opportunity to offer recurring services instead of relying only on one-time projects.

For a deeper look at this angle, read Turning Email Authentication Into a Revenue Engine: Why Australian MSPs Can’t Afford to Ignore DMARC as a Service. Please note that although it’s written for Australian MSPs, the same principles apply to providers in any market.

As your client base grows, managing DMARC manually becomes increasingly difficult. A dedicated DMARC platform for MSPs, such as the EasyDMARC MSP Program, can centralize monitoring, reporting, and policy management across multiple customer domains.

DMARC Projects Often Uncover Other Security Gaps

A DMARC project can reveal much more than email authentication issues. While reviewing sending sources, Service providers often discover legacy systems still sending emails, unknown SaaS applications, poorly configured records, or third-party services that were never properly documented.

These findings can lead to valuable conversations about broader security improvements. In many cases, a DMARC project serves as the starting point for additional services, such as Microsoft 365 security reviews, compliance assessments, vCISO engagements, or managed security programs.

Scale Services Without Growing Your Team

Managing a few domains manually is possible. Managing dozens or hundreds quickly becomes difficult. As an MSP grows, it needs better visibility, automated reporting, and a simpler way to manage multiple client environments from one place.

A dedicated DMARC platform helps MSPs do exactly that. Teams can manage more customers, spend less time on manual tasks, and deliver a consistent service without hiring additional staff.

For providers looking to strengthen their overall security stack, our guide on the Best MSP Security Tools for Cybersecurity and Client Protection covers additional technologies that can help MSPs improve efficiency, visibility, and client protection.

A Step-by-Step Approach to DMARC Deployment

Publishing a DMARC record is only one part of the process. To get real protection, MSPs need to understand how a client sends email, fix authentication issues, and move toward enforcement without affecting legitimate email traffic. Here is what a careful approach looks like:

Start With Comprehensive Sender Discovery

Before enforcing DMARC, MSPs need to identify every service that sends emails on behalf of a client.

This step is often more difficult than it sounds. Many organizations have email senders that were set up years ago and are no longer properly documented. Different teams may also use tools and services that IT teams aren’t fully aware of. If even one legitimate sender is missed, its emails may fail authentication checks once stricter DMARC policies are applied. That can lead to delivery issues, customer complaints, and unnecessary troubleshooting.

To speed up the discovery process, MSPs can use the EasyDMARC SPF Record Lookup to review existing SPF records and identify authorized sending sources that may require further investigation.

Analyze DMARC Reports Effectively

Once DMARC is in place, reports start providing visibility into who is sending emails from a domain and whether those emails pass authentication checks.

These reports can help MSPs:

• Discover unknown services or suspicious sources sending emails on behalf of a client’s domain without permission.

• Spot phishing campaigns and fake emails that are trying to impersonate the organization.

• Identify authentication problems that could affect email delivery or prevent DMARC from working properly.

• Confirm that approved email platforms are configured correctly and are sending authenticated messages.

• Track changes in email activity and quickly identify new issues as client environments evolve.

DMARC reports are sent as XML files, which can be difficult to read. The EasyDMARC XML Report Analyzer turns them into simple dashboards, making it easier to spot authentication issues and track email activity.

Move Toward Enforcement Gradually

One of the biggest mistakes organizations make is moving directly to a reject policy before understanding their email environment. A gradual rollout gives MSPs time to find problems and fix them before legitimate emails are affected.

For successful deployments, MSPs follow these steps:

• Start with a monitoring policy (p=none): This allows organizations to collect DMARC data without blocking or quarantining any emails.

• Review authentication activity: Analyze DMARC reports to identify all legitimate senders and uncover authentication failures.

• Fix SPF and DKIM issues: Resolve configuration problems and ensure authorized email sources are properly authenticated.

• Move to quarantine: Start directing suspicious emails to spam folders while continuing to monitor for legitimate email failures.

• Transition to reject: Once authentication issues have been resolved, block unauthorized emails from reaching recipients altogether.

Following this phased approach helps MSPs strengthen security while minimizing the risk of disrupting legitimate business communications. It also gives clients confidence that DMARC is being implemented carefully and correctly.

Grow Your DMARC Practice With EasyDMARC

EasyDMARC’s MSP Program is designed for service providers that want to deploy and manage DMARC at scale. With multi-tenant management, centralized visibility, automated monitoring, simplified reporting, and easier onboarding, MSPs can manage more client domains without adding extra workload to their teams.

The program also includes white-label reporting, allowing MSPs to share branded reports with clients. In addition, partners get access to technical support, training resources, and sales materials that can help them onboard new clients and grow their DMARC services faster.

Whether your goal is to keep clients longer, support compliance projects, create recurring revenue, or expand your cybersecurity services, EasyDMARC gives you the tools and support to make it happen.

Start a free trial or talk to the EasyDMARC team to see how the MSP Program can help protect your clients from email-based threats while helping your business grow.