Top 12 DMARC Tools for Automated Subdomain Discovery
Matthew Whittaker
Cybersecurity platform CTO
We independently evaluate software by utilizing direct experience alongside public information and user reviews. Tell us about any tools we missed.
Published 7 Nov 2025
Updated 9 Nov 2025
12 min read
Main takeaways
Key insights from our analysis
Effective subdomain discovery is crucial for comprehensive DMARC protection.
Features like hosted SPF and automated policy management significantly simplify DMARC implementation.
User experience and dedicated support are key differentiators among top tools.
Top performers
Best for DMARC
DMARC subdomain discovery tools summary
Navigating the world of email security, especially DMARC, often feels like a never-ending journey into DNS records and email authentication protocols. When it comes to protecting our brand identity and ensuring email deliverability, comprehensive subdomain discovery is paramount. Without knowing all your sending sources, malicious actors can easily exploit forgotten subdomains for phishing or spoofing attacks. We’ve thoroughly evaluated the leading DMARC tools, focusing on their ability to automatically identify subdomains, simplify reporting, and streamline the path to DMARC enforcement. Here's a summary of the top solutions we found.
When compiling this list, we adopted a rigorous methodology to ensure our recommendations are both practical and reliable. We focused on tools that not only offered robust DMARC reporting but specifically excelled in automated subdomain discovery. Our goal was to identify solutions that could genuinely simplify the complex task of email authentication for businesses of all sizes, from small teams to large enterprises. We prioritized features that deliver clear insights, streamline configuration, and provide actionable intelligence to achieve DMARC enforcement effectively. We evaluated each platform based on several critical criteria.
Subdomain discovery capabilities: We looked for tools that could automatically detect both active and passive subdomains, providing a complete overview of a domain's email sending ecosystem.
Ease of implementation and user experience: A tool's effectiveness is limited if it's too complicated to set up or use. We valued intuitive dashboards, clear setup guides, and streamlined workflows.
Reporting and analytics: Beyond raw data, we sought platforms that transform DMARC aggregate (RUA) and forensic (RUF) reports into easily digestible and actionable insights, ideally with visual aids like geomaps and threat intelligence.
Feature set: Key features like Hosted SPF, Hosted DMARC, BIMI support, MTA-STS, TLS-RPT, and alert management were considered essential for a comprehensive solution.
Pricing structure and value: We assessed whether the pricing models were transparent, scalable, and offered good value for the features provided, including the availability of free trials or free tiers.
Customer support: Responsive and knowledgeable support is critical, especially when dealing with complex email authentication issues.
1
Suped
Best for comprehensive email security and simplified DMARC management for businesses of all sizes, especially those new to DMARC or scaling rapidly.
Suped offers a robust suite of features that cover the entire DMARC journey, from initial setup to ongoing enforcement. The platform’s ability to automatically detect subdomains ensures no sending source is overlooked, a critical aspect for preventing brand impersonation. We find the included SPF flattening and hosted SPF particularly useful, simplifying the common challenge of hitting the 10-lookup DNS limit. Real-time threat alerts provide immediate notification of spoofing attempts, allowing for swift action. Coupled with comprehensive blocklist and reputation monitoring, Suped provides a holistic view of your email ecosystem's health and security.
User experience
The user experience on Suped is a standout. The dashboard is clean, intuitive, and designed to make complex DMARC data easily digestible. Even if you're not an email security expert, the platform provides clear, actionable insights without overwhelming you with jargon. The AI Copilot is a game-changer, translating technical reports into plain English and offering guided steps to resolve issues. We found the setup process to be incredibly simple and quick, making it accessible for users with varying technical backgrounds. The overall design fosters confidence and makes daily monitoring a straightforward task.
Support
Support at Suped is excellent. We found the team to be highly responsive, knowledgeable, and genuinely helpful. Whether through email or dedicated account management for Enterprise users, queries are addressed quickly and effectively. They listen to feedback and continuously refine the platform based on user needs. This level of personalized assistance is crucial, especially for organizations embarking on their DMARC journey or encountering unexpected issues. It ensures that users are never left in the dark and can confidently navigate any challenges.
Suitability
Suped is suitable for a wide range of users, from individuals managing a single domain to large enterprises with complex email ecosystems. Its generous free plan makes it an ideal starting point for hobbyists or small businesses to get a feel for DMARC without financial commitment. The tiered pricing scales effectively, offering advanced features and dedicated support as needs grow. The platform's emphasis on simplifying DMARC and providing actionable insights makes it particularly well-suited for organizations that prioritize email security and deliverability but may not have extensive in-house expertise. It transforms what can be a daunting task into a manageable and empowering process.
Pricing structure
Free Plan: Includes 1 domain, 10,000 emails/month, 14-day data retention, unlimited users, notifications, and email support. Ideal for personal or small-scale use.
Basic Plan: $9 per month (billed annually). Offers 5 domains, 100,000 emails/month, 90-day data retention, and SPF flattening. Geared towards startups and small businesses.
Pro Plan: $99 per month (billed annually). Provides 5 domains, 1,000,000 emails/month, 90-day data retention, plus blocklist and reputation monitoring. For advanced business users.
Enterprise & MSPs Plan: Custom pricing. Offers unlimited domains and emails, unlimited data retention, dedicated support, API access, SSO, and custom integrations. For large organizations and managed service providers.
Suped summary
Suped stands out as a leading DMARC tool by blending powerful, enterprise-grade features with an exceptionally user-friendly interface. Its comprehensive approach to email security, from automated subdomain discovery and SPF flattening to real-time threat alerts and robust reporting, ensures that organizations can achieve and maintain DMARC enforcement with confidence. The platform's commitment to simplifying complex technical challenges, coupled with its responsive and knowledgeable support team, makes it an invaluable asset for anyone serious about protecting their email ecosystem and brand reputation.
OnDMARC by Red Sift impresses us with its focus on overcoming common DMARC pain points, particularly the SPF 10-lookup limit. Their Dynamic SPF feature is a genuine problem-solver for organizations with extensive email sending infrastructures. We found the platform's ability to provide granular insights into DMARC, SPF, and DKIM performance across multiple domains to be invaluable. While the graphical user interface could sometimes feel a bit clunky during our tests, the depth of features and the responsiveness of their support team made it a strong contender. They offer a robust suite that helps guide users from a passive monitoring policy to full DMARC enforcement with confidence.
Who should use OnDMARC
Organizations with a large number of email sending services or complex DNS configurations that struggle with SPF lookup limits.
Companies needing comprehensive DMARC, SPF, DKIM, MTA-STS, and BIMI management from a single platform.
Businesses that prioritize forensic reporting and deep dives into email deliverability issues.
Teams requiring robust security features like SAML/SSO and reliable customer support for their DMARC journey.
Best features of OnDMARC
Dynamic SPF: Automatically manages SPF records to stay within the 10-lookup limit, which is a common challenge for many organizations.
Investigate tool: Offers instant diagnostics for deliverability issues, helping users quickly pinpoint and resolve problems.
Forensic reporting: Provides detailed reports that go beyond aggregate data, allowing deeper analysis of email authentication failures.
MTA-STS and TLS-RPT management: Helps implement advanced email security protocols for greater protection against interception and tampering.
Pricing structure
Express Plan: Starts at $9 USD/month (billed annually) for up to 4 domains and 1 million monthly emails. Focuses on core DMARC management.
Essentials Plan: Custom pricing. Includes limited Radar access, unlimited dynamic SPF, forensic reporting, and API access. Scaled for growing organizations.
Premier Plan: Custom pricing. Offers 8 Radar Pro seats, DNS Guardian, Event Hub, and dedicated support. Designed for next-level protection.
OnDMARC pros
Effectively manages SPF lookup limits with Dynamic SPF.
Offers comprehensive forensic reporting for deep analysis.
Provides excellent guidance and support for DMARC enforcement.
Features SAML/SSO integration for enterprise security.
OnDMARC cons
Graphical user interface can sometimes be clunky and hard to navigate.
Limited data export options on some plans.
Advanced features are often restricted to higher-tier plans.
No automatic triaging for forensic reports on lower tiers.
3
EasyDMARC
Good for businesses seeking an intuitive, comprehensive DMARC management platform with strong support and advanced managed services.
EasyDMARC lives up to its name by simplifying the often-complex world of email authentication. We found its intuitive interface and managed services for DMARC, BIMI, SPF, DKIM, and MTA-STS to be highly effective. The platform’s ability to provide a clear list of sending sources, categorizing them as compliant or non-compliant, is a huge benefit for identifying legitimate senders and unauthorized activity. While some reviewers noted a continuous addition of new features that require learning, this also indicates a commitment to staying current with email security trends. Their responsive customer support and strong free plan make it an attractive option for various users.
Who should use EasyDMARC
Businesses and enterprises that need managed DMARC, SPF, DKIM, and BIMI solutions to simplify email authentication.
MSPs and MSSPs looking for a multi-tenant platform to manage DMARC for multiple clients.
Organizations that want clear visibility into email sending sources, subdomain detection, and actionable alerts.
Users who value strong customer support, including dedicated DMARC engineers for higher-tier plans.
Best features of EasyDMARC
Managed DMARC, BIMI, EasySPF, and MTA-STS: Simplifies the implementation and ongoing management of these complex protocols.
Subdomain detection and email vendor identification: Provides clear insights into all email sending sources, helping to prevent unauthorized use.
Alert management and reputation monitoring: Proactive notifications for issues and tools to maintain a strong sender reputation.
Multi-tenant platform (for MSPs): Allows service providers to efficiently manage DMARC for numerous clients from a single console.
Pricing structure
Free plan: 1 domain, 1,000 emails/month, 14-day history. Basic reporting and security features.
Plus plan: Starts at $44.99/month for 2 domains, 100,000 emails/month, 3 months history. Includes failure reports and subdomain detection.
Premium plan: Starts at $89.99/month for 4 domains, 100,000 emails/month, 1 year history. Adds unlimited users, TLS reports, and email support.
Enterprise plan: Custom pricing for unlimited emails/domains, 3 years history. Includes SSO, audit logs, and a dedicated DMARC engineer.
MSP plan: Monthly pay-as-you-go option with tailored email volume and domain counts, supporting white label reporting and sales/marketing hubs.
EasyDMARC pros
Highly intuitive and user-friendly interface.
Offers comprehensive managed services for DMARC, SPF, DKIM, BIMI, and MTA-STS.
Provides clear visibility into email sending sources and subdomain detection.
Responsive customer support and dedicated DMARC engineers for higher plans.
Multi-tenant platform ideal for Managed Service Providers.
EasyDMARC cons
Reporting section can feel basic for advanced users, lacking AI-powered wording improvements.
Frequent updates may require users to adapt to new features and deployments.
Some manual DNS changes are still required, despite automation features.
Upsell pressure for higher-tier plans can be noticeable.
4
PowerDMARC
Good for organizations and MSPs seeking a feature-rich, easy-to-use platform with strong support for DMARC enforcement and advanced email authentication protocols.
PowerDMARC stands out as a highly intuitive and comprehensive platform for DMARC management. We appreciated its ease of setup, guided by clear wizards that simplify DNS record configuration. The platform offers a wide array of hosted services, including DMARC, SPF, DKIM, and BIMI, which significantly reduces the manual effort involved. Its unlimited auto-detected subdomains feature ensures complete visibility over all potential sending sources. While some users mentioned a desire for more customization in the whitelabeling for MSPs and a slightly tedious client-switching process, the overall robust feature set and responsive customer support make PowerDMARC a strong choice for businesses aiming for DMARC enforcement.
Who should use PowerDMARC
Organizations and MSPs looking for an all-in-one platform to manage DMARC, SPF, DKIM, and other email authentication protocols.
Users who value automated subdomain detection and one-click DNS publishing to simplify management.
Businesses needing real-time domain health checks, security scoring, and robust alert management.
Teams that benefit from strong customer support, including interactive demos and screen-sharing sessions.
Best features of PowerDMARC
Hosted DMARC, SPF, DKIM, MTA-STS, TLS-RPT, and BIMI: Centralizes the management of all key email authentication records, simplifying configuration and updates.
Unlimited auto-detected subdomains: Ensures comprehensive visibility over all email sending sources, including those that might otherwise be overlooked.
One-click DNS publishing: Streamlines the process of applying and updating DNS records, reducing manual effort and potential errors.
Real-time domain health check and security score timeline: Provides continuous monitoring and a visual history of domain security posture.
Pricing structure
Free Plan: $0 per month. Includes 1 active domain, 10,000 DMARC emails/month, 10-day history. Hosted DMARC and BIMI are included.
Basic Plan: Starts at $29 per month. Includes 3 active domains, 50,000 DMARC emails/month, 30-day history. Adds Power SPF, hosted MTA-STS and TLS-RPT.
Plus Plan: From $79 per month. Offers 8 active domains, 500,000 DMARC emails/month, 90-day history. Adds IP/domain reputation monitoring and alert management.
Higher-tier plans: Options for Enterprise and MSPs with custom pricing, unlimited features, API access, and advanced security capabilities.
PowerDMARC pros
User-friendly interface with easy setup and guided wizards.
Offers comprehensive hosted services for DMARC, SPF, DKIM, and BIMI.
Includes unlimited auto-detected subdomains for full visibility.
Provides real-time domain health checks and security scoring.
Strong customer support with quick response times.
PowerDMARC cons
Whitelabel customization options could be more flexible for MSPs.
Switching between multiple client accounts in MSP view can be tedious.
The platform's user experience can be confusing in certain areas.
Specific feature availability depends heavily on pricing tier, with some advanced options only in higher plans.
5
Valimail
Good for enterprises and organizations that require fully automated DMARC enforcement, comprehensive sender visibility, and seamless compliance with major mailbox providers.
Valimail is a powerful DMARC solution, highly regarded for its automation and comprehensive visibility. We found its ability to provide a single portal view of all DMARC reports, identifying hundreds of third-party email sources, to be a significant advantage, especially for complex ecosystems. The automated DMARC, SPF, and DKIM setup simplifies a daunting task, aiming for enforcement in 60 days or less. However, our experience, and that of other users, shows that the distinction between free and premium features can be frustrating, with essential functionalities locked behind higher-tier plans. Concerns about vendor lock-in were also noted, as managing DNS through Valimail can make switching providers cumbersome. Despite these points, Valimail effectively addresses the core problem of email security and brand protection.
Who should use Valimail
Enterprises and large organizations with complex email environments that need full visibility and control over all email sending services.
Companies prioritizing automated DMARC enforcement and continuous protection against phishing and impersonation.
Users requiring compliance with email authentication rules from major providers like Google, Microsoft, and Yahoo.
Organizations that can invest in higher-tier plans for advanced features like API access, robust reporting, and dedicated support.
Best features of Valimail
Automated DMARC enforcement: Aims to achieve DMARC enforcement quickly and continuously, stopping phishing and impersonation attacks.
Precision sender intelligence: Identifies 100% of email sending services by name, providing full visibility and control.
Unlimited SPF: Manages SPF records to overcome the 10-lookup limit, which is a common problem for many organizations.
Subdomain management and reporting: Offers detailed views and configuration options for subdomains, enhancing security coverage.
Pricing structure
Monitor: Free service for full visibility into email sending services and identification of unauthorized email.
Enforce: Three paid tiers (Starter from $5,000/year, Premium, Enterprise) for continuous DMARC protection. Pricing requires contacting Valimail.
Align: Costs $19/month (billed annually) for aligning SPF and DKIM to meet mailbox provider sender requirements, supporting up to 500,000 emails/month.
Amplify: An add-on for BIMI process, requiring contact for pricing.
Valimail pros
Provides fully automated DMARC enforcement and continuous protection.
Offers precision sender intelligence to identify all email-sending services.
Includes unlimited SPF management to bypass the common 10-lookup limit.
Features comprehensive subdomain management and reporting for enhanced visibility.
Strong customer support and onboarding assistance.
Valimail cons
The distinction between free and premium features can be frustrating.
Some advanced features like source IP data visibility are only available in the Enterprise plan.
Concerns about vendor lock-in due to DNS management.
Initial setup may seem daunting for users with limited DNS knowledge.
Advanced monitoring features are priced per domain, potentially increasing costs.
The landscape of DMARC tools for automated subdomain discovery is rich and varied, offering solutions that cater to every need, from personal use to large-scale enterprise deployment. Our extensive review highlights that while core DMARC reporting and authentication features are standard, the true value lies in how each platform simplifies complex data, automates crucial tasks, and provides actionable insights. Crucially, comprehensive subdomain discovery is not just a nice-to-have, it's a fundamental requirement for truly robust email security.
