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What are the best methods for identifying email sending vendors for DMARC enforcement?

Summary

Identifying all email sending vendors is a critical, yet often complex, step toward achieving DMARC enforcement. While DMARC reports provide valuable technical data like IP addresses and sending domains, they typically lack the granular detail needed to pinpoint the specific internal departments or individual users responsible for an email stream. This gap necessitates a combination of technical analysis, internal communication, and robust organizational processes to ensure all legitimate email sources are identified and properly configured for DMARC alignment.

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What email marketers say

Email marketers often face significant hurdles when attempting to identify all email sending vendors, particularly in large organizations. Their perspective highlights the disconnect between the technical data provided by DMARC reports and the practical need to know which internal teams or individuals are responsible for specific email streams. This challenge often stems from decentralized email sending practices and a lack of clear communication channels between marketing, IT, and finance departments.

Marketer view

Email marketer from Email Geeks notes that while DMARC reporting used to be expensive, free services are now available, shifting the main roadblock to clients allocating sufficient time for DMARC implementation and vendor management.

20 Aug 2020 - Email Geeks

Marketer view

An email marketer from Expert Insights advises that the most significant challenge in DMARC deployments often involves replacing or finding workarounds for vendors and software that do not comply with DMARC requirements, which can be a time-consuming process.

20 Jan 2024 - Expert Insights

What the experts say

Experts in email deliverability and DMARC deployment emphasize that identifying all email sending vendors is fundamentally a project management and governance challenge, not solely a technical one. They advocate for systematic approaches, including comprehensive supplier audits and establishing clear internal processes, to gain full visibility over all email streams. While DMARC reports are a vital tool for discovery, they are most effective when integrated into a broader organizational strategy.

Expert view

Deliverability expert from Spamresource advises that comprehensive DMARC deployment necessitates a thorough, ongoing audit of all email sending sources, including those that are not immediately obvious or are managed by third-party vendors.

20 May 2024 - Spamresource

Expert view

A DMARC expert from Word to the Wise explains that the primary challenge in DMARC enforcement is often the internal discovery of all legitimate sending domains and IP addresses, especially in distributed organizations with multiple departments.

15 Feb 2025 - Word to the Wise

What the documentation says

Official DMARC documentation and related RFCs outline the structure of DMARC reports, specifying what data is included and why certain information (like granular sender identities) is intentionally omitted. The emphasis is on providing aggregate views of email authentication results, enabling domain owners to monitor sending behavior and identify unauthorized use of their domains. The documentation implicitly supports the need for external processes to map technical sending data to specific organizational entities.

Technical article

RFC 7489 (DMARC) states that aggregate reports (RUAs) are designed to provide domain owners with statistical data about emails claiming to be from their domain, including IP addresses, SPF and DKIM authentication results, and DMARC policy evaluations.

March 2015 - RFC 7489

Technical article

The DMARC.org documentation specifies that while forensic reports (RUFs) offer more detailed message-level data for authentication failures, their use has become rare due to privacy concerns and the potential for revealing sensitive email content.

01 Oct 2020 - DMARC.org

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