Is a third-party sender reputation assessment worth it if DMARC/DKIM issues are already identified?

Summary

While DMARC/DKIM authenticate email, sender reputation is a complex, ongoing factor influencing deliverability. Experts and marketers agree that third-party assessments are valuable even when DMARC/DKIM are in place. These assessments provide deeper insights by reviewing sending practices, IP/domain reputation, and technical settings. They can uncover hidden issues such as low engagement, spam complaints, and problems stemming from shared IPs, which DMARC/DKIM do not address. Factors like complaint rates, spam trap hits, sending volume, sender history, and list hygiene all contribute to sender reputation and require continuous monitoring. Tools from companies like EHawk, Validity, Blackbox, and Inbox Monster aid in this process.

Key findings

  • Authentication Not Enough: DMARC/DKIM authenticate but don't guarantee deliverability; reputation matters.
  • Deeper Insights Needed: Third-party assessments uncover hidden issues beyond DMARC/DKIM.
  • Reputation is Dynamic: Sender reputation is an ongoing factor that fluctuates over time.
  • Shared IPs Impact: Shared IPs can negatively impact reputation, requiring monitoring.
  • Comprehensive Review: Audits review sending practices, IP reputation, and technical settings.
  • Multiple Factors: Complaint rates, spam traps, volume, history, and list hygiene affect deliverability.

Key considerations

  • Ongoing Monitoring: Continuously monitor sender reputation metrics and address issues promptly.
  • IP Strategy: If using shared IPs, be aware of the potential impact on your reputation and consider dedicated IPs.
  • Address Complaints: Minimize complaint rates and avoid spam traps through list hygiene and relevant content.
  • Holistic Approach: Combine authentication (DMARC/DKIM) with proactive reputation management.
  • Tool Selection: Evaluate different third-party assessment tools and choose one that meets your needs.
  • Take Action: Use assessment findings to improve sending practices and address any identified issues.

What email marketers say
9Marketer opinions

While DMARC/DKIM address email authentication, sender reputation is a broader concept encompassing factors like IP reputation, spam complaints, engagement rates, and list hygiene. Third-party assessments offer value even with DMARC/DKIM in place, as they provide deeper insights into deliverability bottlenecks, identify issues on shared IPs, monitor fluctuations in reputation, and analyze various data points beyond authentication. These assessments also help identify issues related to poor list hygiene, content problems, and spam trap hits, which DMARC alone cannot resolve. Companies like EHawk, Validity, Blackbox, and Inbox Monster offer tools for sender reputation analysis.

Key opinions

  • DMARC/DKIM Isn't Enough: DMARC/DKIM addresses authentication but not all factors impacting sender reputation.
  • Deeper Insights: Third-party assessments provide insights beyond basic DMARC/DKIM checks.
  • Shared IP Problems: Assessments help identify if shared IP reputation affects deliverability.
  • Monitoring Essential: Ongoing monitoring is necessary as reputation fluctuates.
  • Comprehensive View: Assessments analyze blacklist status, spam traps, feedback loops.
  • Addresses List Hygiene: Poor list hygiene and content issues impact reputation despite DMARC.

Key considerations

  • Reputation Fluctuations: Sender reputation is dynamic and requires continuous monitoring.
  • Shared IP Impact: If using shared IPs, assess the impact of other senders on your reputation.
  • Data Points Analyzed: Understand which data points (blacklist status, spam traps, etc.) are included in the assessment.
  • Remediation Strategies: Identify actionable steps to improve sender reputation based on assessment findings.
  • Tool Selection: EHawk, Validity, Blackbox, and Inbox Monster are examples of assessment tools.
  • Comprehensive Analysis: Assessments help analyse and deal with spam hits, feedback loops and more.
Marketer view

Email marketer from GlockApps states that a third-party assessment provides a more comprehensive view of sender reputation by analyzing various data points like blacklist status, spam trap hits, and feedback loop data, offering insights beyond DMARC/DKIM results.

September 2022 - GlockApps
Marketer view

Email marketer from Validity notes that ongoing monitoring of sender reputation is essential even with DMARC/DKIM in place, as reputation can fluctuate due to various factors like spam complaints and engagement rates.

January 2023 - Validity
Marketer view

Email marketer from Stack Overflow highlights that if you are on shared IPs, a third party tool can help identify if your IP's reputation is affected by others on the same IP Pool.

October 2024 - Stack Overflow
Marketer view

Email marketer from Reddit explains that even with passing DMARC, poor list hygiene or content issues can negatively impact your sender reputation and deliverability, making an external assessment useful.

December 2021 - Reddit
Marketer view

Email marketer from SendPulse suggests that while DMARC/DKIM address authentication, sender reputation involves a broader evaluation of sending behavior and infrastructure, which a third-party assessment can help uncover.

January 2025 - SendPulse
Marketer view

Email marketer from Email Geeks says Inbox Monster can identify issues with IP reputation, offering a Search History tool to see the last 90 days of data for any domain or IP.

September 2021 - Email Geeks
Marketer view

Email marketer from Email Geeks shares that companies like EHawk, Validity, Blackbox by Email Industries, and Inbox Monster all have tools based on trap networks, often called vetting tools.

January 2022 - Email Geeks
Marketer view

Email marketer from Mailjet highlights that a third-party assessment can offer deeper insights into sender reputation beyond basic DMARC/DKIM checks, potentially uncovering hidden deliverability bottlenecks.

December 2024 - Mailjet
Marketer view

Email marketer from Neil Patel explains that monitoring sender reputation helps identify deliverability issues, improve inbox placement, and maintain a positive sending reputation.

January 2023 - Neil Patel

What the experts say
4Expert opinions

Even when DMARC/DKIM are implemented, assessing sender reputation through third-party audits remains valuable. These audits review sending practices, IP/domain reputation, and technical settings, and can uncover hidden deliverability issues like low engagement or spam complaints that DMARC alone does not address. These are ongoing factors and also other important ones such as complaint rates, spam trap hits and sending volume. Furthermore, these assessments are beneficial for companies using shared IPs, aiding in the decision of whether to switch to dedicated IPs.

Key opinions

  • DMARC/DKIM Insufficient: DMARC/DKIM, while important, do not cover all aspects of sender reputation.
  • Comprehensive Audits: Deliverability audits review sending practices, IP/domain reputation, and technical settings.
  • Uncover Hidden Issues: Third-party assessments identify issues like low engagement and spam complaints.
  • Shared IP Considerations: Assessments assist in determining the best IP strategy (shared vs. dedicated).
  • Factor Influence: Complaint rates, spam trap hits, and sending volume, influence sender reputation and deliverability.

Key considerations

  • Ongoing Factor: Sender reputation is a continuous factor impacting deliverability.
  • Comprehensive Review: Ensure the assessment covers all relevant sending practices and technical settings.
  • Actionable Insights: The assessment should provide insights that can be acted upon to improve deliverability.
  • IP Strategy: Carefully consider the advantages and disadvantages of shared versus dedicated IPs.
  • Holistic View: Consider a combination of Authentication such as SPF, DKIM and DMARC while assessing factors affecting deliverability.
Expert view

Expert from Word to the Wise emphasizes that while DMARC/DKIM is important, sender reputation is an ongoing factor that influences deliverability. A third-party assessment can help uncover hidden issues like low engagement or spam complaints that DMARC alone doesn't address.

January 2022 - Word to the Wise
Expert view

Expert from Spamresource.com responds that factors beyond authentication, such as complaint rates, spam trap hits, and sending volume, influence sender reputation and deliverability.

October 2022 - Spamresource.com
Expert view

Expert from Email Geeks confirms that it's common to do a deliverability audit, reviewing sending practices, IP/domain reputation, and technical settings.

November 2021 - Email Geeks
Expert view

Expert from Email Geeks suggests it's common to audit companies even on shared IPs, and a consultant can discuss whether shared or dedicated IP is the best path forward.

February 2022 - Email Geeks

What the documentation says
3Technical articles

Email deliverability relies heavily on maintaining a good sender reputation, according to Google Postmaster Tools. This involves consistent monitoring of reputation metrics to identify and address deliverability issues. Microsoft documentation further clarifies that factors beyond email authentication, such as complaint rates, spam trap hits, and sending volume, significantly impact sender reputation and deliverability. RFC documentation adds that while SPF helps prevent sender address forgery, sender reputation is a broader consideration encompassing sender history and behavior, thereby necessitating ongoing monitoring and assessment even when SPF is in place.

Key findings

  • Reputation is Crucial: Maintaining a good sender reputation is crucial for email deliverability.
  • Beyond Authentication: Factors beyond authentication (complaint rates, spam traps, volume) influence reputation.
  • Continuous Monitoring: Sender reputation requires continuous monitoring and assessment.
  • Broad Evaluation: Sender history and behavior are key components of sender reputation.

Key considerations

  • Monitor Metrics: Actively monitor reputation metrics provided by tools like Google Postmaster Tools.
  • Address Complaints: Take steps to minimize complaint rates and spam trap hits.
  • Sending Volume: Manage sending volume to avoid triggering spam filters.
  • Historical Data: Be aware that sender history influences current deliverability.
Technical article

Documentation from Google Postmaster Tools emphasizes that maintaining a good sender reputation is crucial for ensuring emails reach the intended recipients. They suggest monitoring reputation metrics to identify and address any issues affecting deliverability.

June 2023 - Google Postmaster Tools
Technical article

Documentation from RFC specifies that while SPF helps prevent sender address forgery, sender reputation involves broader factors like sender history and behavior, which require additional monitoring and assessment.

July 2023 - RFC
Technical article

Documentation from Microsoft details that factors beyond authentication, such as complaint rates, spam trap hits, and sending volume, influence sender reputation and deliverability.

June 2021 - Microsoft