How to resolve domain blocklisting and improve email reputation?

Summary

Improving email deliverability and resolving domain blocklisting requires a multifaceted approach. Key strategies include prioritizing Google's reputation by encouraging user interaction, implementing strong email authentication (SPF, DKIM, DMARC), and maintaining impeccable list hygiene through regular removal of inactive subscribers. Experts advise identifying and rectifying the root causes of blocklisting before requesting removal, demonstrating corrective actions to blocklist providers. Proactive measures include monitoring sender reputation through tools like Google Postmaster Tools and feedback loops, managing IP reputation to avoid snowshoe spamming, preventing abuse by monitoring systems for unusual activity, and adhering to permission-based marketing practices. While some sources suggest SORBS has minimal impact, the overall consensus stresses the importance of continuous monitoring, adaptation, and a holistic strategy combining technical measures, list management, and reputation monitoring.

Key findings

  • Prioritize User Engagement with Gmail: Focus on improving email engagement metrics to boost your reputation with Google's filtering algorithms.
  • Implement Email Authentication: Use SPF, DKIM, and DMARC to authenticate your emails, prevent spoofing, and build trust with ISPs.
  • Maintain Strict List Hygiene: Regularly remove inactive, unengaged, and invalid email addresses to improve deliverability.
  • Identify and Address Root Causes: Investigate and fix the underlying issues causing blocklisting before requesting removal.
  • Monitor and Manage Reputation: Proactively monitor your sender reputation using tools like Google Postmaster Tools and feedback loops.
  • Proactive Abuse Prevention: Implement proactive measures to monitor systems for unusual activity, block suspicious signups, and secure compromised accounts.

Key considerations

  • SORBS Listing Impact: While some suggest SORBS blocklisting has low impact, it's prudent to investigate and address if listed.
  • Authentication Complexity: Implementing SPF, DKIM, and DMARC requires technical expertise and careful configuration.
  • Adapt to Evolving Policies: Email authentication and deliverability strategies may need to be adjusted over time based on evolving ISP policies.
  • Engage with ESP Support: In case of deliverability issues, contact your email service provider's support team.
  • Holistic Approach: Combine technical measures, list hygiene, and reputation management for sustained improvements.
  • Gradual Volume Increase: If starting with a new IP/Domain, gradually increase sending volume to build a positive sending history.

What email marketers say
12Marketer opinions

Resolving domain blocklisting and improving email reputation involves several key strategies. Initial steps include identifying the cause of the blocklisting, which often stems from sending to unengaged data or poor list hygiene. Experts recommend implementing strong email authentication (SPF, DKIM, DMARC), consistently cleaning email lists by removing invalid addresses and inactive subscribers, and gradually increasing sending volume to establish a positive sending history with ISPs. Monitoring sender reputation through tools like Google Postmaster Tools, feedback loops, and MultiRBL is crucial for early detection of deliverability issues. Engaging in permission-based marketing, ensuring explicit consent from subscribers, and providing easy unsubscribe options are also vital for building trust and maintaining a positive sender reputation. Avoid relying on 'snake oil' tools and instead focus on root causes.

Key opinions

  • Identify Root Cause: Determine the underlying reasons for blocklisting, such as sending to unengaged recipients or poor list hygiene.
  • Implement Authentication: Employ SPF, DKIM, and DMARC to authenticate emails, preventing spoofing and improving deliverability.
  • Clean Email Lists: Regularly remove invalid addresses and inactive subscribers to improve sender reputation.
  • Monitor Sender Reputation: Use tools and feedback loops to track spam rates, complaints, and overall reputation.
  • Permission-Based Marketing: Obtain explicit consent from subscribers and provide easy unsubscribe options.

Key considerations

  • SORBS Impact: While some believe SORBS has minimal impact, others suggest resolving listing issues after addressing the underlying cause.
  • Tools vs. Practices: Focus on fundamental email practices and policies rather than relying solely on deliverability tools.
  • Gradual Volume Increase: Gradually increase sending volume to establish a positive sending history.
  • Investigate Sudden Drops: If you see a sudden drop in reputation, investigate the cause immediately, checking sending practices and bounce rates.
  • Contact ESP Support: In case of deliverability issues, reach out to your email service provider's support team to understand any platform-related factors and get specific guidance.
Marketer view

Email marketer from SendPulse shares that to clean email lists, remove invalid email addresses, unsubscribe inactive subscribers, and segment subscribers based on their engagement. Regularly cleaning your list improves your sender reputation and deliverability.

July 2021 - SendPulse
Marketer view

Email marketer from Validity (formerly Return Path) advises monitoring feedback loops (FBLs) to track complaints from recipients. Addressing complaints promptly helps improve your sender reputation and maintain good deliverability.

June 2024 - Validity
Marketer view

Marketer from Email Geeks suggests it's probably safe to ignore SORBS blocklisting as it's not widely referenced and can lead to false positives. Recommends creating an account on their website to find out why they listed you and request delisting if desired.

February 2024 - Email Geeks
Marketer view

Marketer from Email Geeks explains policy and practices are the way to go for fixing reputation. The “tools” to help with deliverability are mostly snake oil and a distraction from the real work. The first step is find the root cause of what is causing your deliverability issues.

April 2023 - Email Geeks
Marketer view

Email marketer from GlockApps shares to monitor email deliverability by using tools that simulate sending to multiple inboxes to identify placement issues. Also use feedback loops to track complaints.

August 2022 - GlockApps
Marketer view

Email marketer from WebHostingTalk forum suggests to gradually increase sending volume over time to establish a positive sending history with ISPs and avoid triggering spam filters. Ramp up the volume slowly, and consistently monitor deliverability.

August 2024 - WebHostingTalk
Marketer view

Email marketer from Litmus details proactive email reputation management including consistently authenticating emails, monitoring sender reputation, segmenting lists, cleaning inactive subscribers, and analyzing engagement metrics to catch problems early.

April 2023 - Litmus
Marketer view

Email marketer from HubSpot explains that permission-based marketing is key. Only send emails to contacts who have explicitly opted in to receive them, and ensure you always include an easy way for recipients to unsubscribe. This helps build trust and maintain a positive sender reputation.

May 2024 - HubSpot
Marketer view

Marketer from Email Geeks says SORBS has a very low impact.

July 2021 - Email Geeks
Marketer view

Marketer from Email Geeks explains SORBS issues arise from sending to unengaged data. Sign up for a SORBS account to review hit dates and list segmentation. Tighten segmentation, then request delisting only after changes to avoid relisting.

January 2023 - Email Geeks
Marketer view

Email marketer from Mailjet explains that to avoid blocklists, ensure explicit consent from subscribers, maintain consistent sending volume, authenticate email with SPF, DKIM, and DMARC, and monitor bounce rates and feedback loops to quickly address issues.

January 2024 - Mailjet
Marketer view

Email marketer from Reddit user r/emailmarketing suggests to immediately investigate the cause, check recent sending practices, review bounce rates, and contact your ESP's support team to understand if there were any changes on their end. Also, check blocklist status via MultiRBL.

July 2021 - Reddit

What the experts say
6Expert opinions

Experts suggest focusing on Google's email reputation, achieved by sending mail that encourages recipient interaction. Addressing blocklisting involves identifying and fixing the root cause before requesting removal, demonstrating corrective actions to the blocklist. Emphasizing list hygiene through regular removal of inactive subscribers is crucial for a clean list, improving sender reputation and preventing blocklisting. Managing IP reputation and preventing 'snowshoe spamming' involves monitoring IP performance, limiting volume per IP, and following email best practices. Finally, preventing future abuse requires system monitoring for unusual activity, blocking suspicious signups, securing compromised accounts with strong passwords and multi-factor authentication, and implementing feedback loops to address user complaints.

Key opinions

  • Prioritize Google Reputation: Focus on sending mail that encourages user interaction to improve Google's perception.
  • Address Root Cause Before Removal: Identify and resolve the underlying issue before requesting blocklist removal, showcasing corrective actions.
  • Maintain List Hygiene: Regularly remove inactive subscribers to prevent blocklisting and improve sender reputation.
  • Manage IP Reputation: Monitor IP performance and limit sending volume per IP to avoid snowshoe spamming.
  • Prevent Future Abuse: Monitor for unusual activity, secure accounts, and implement feedback loops.

Key considerations

  • User Interaction: Actively seek ways to encourage user interaction with your emails, signaling value to machine learning filters.
  • Blocklist Communication: Document all steps taken to resolve the issue and communicate these steps when requesting blocklist removal.
  • Proactive Abuse Prevention: Prevention is easier than cure. Implementing proactive monitoring and security measures can significantly reduce abuse potential.
  • Comprehensive Approach: A holistic approach that combines technical measures (SPF, DKIM, DMARC), list hygiene, and reputation management is key to sustained email deliverability improvements.
  • Segmentation: Ensuring clear segmentation of list can help prevent spam complaints
Expert view

Expert from Word to the Wise suggests to prevent future abuse, monitor your systems for unusual activity. Block any suspicious signups and be aware of any compromised accounts. Use strong password requirements and consider using multi-factor authentication and implement feedback loops to monitor user complaints and address issues promptly.

November 2024 - Word to the Wise
Expert view

Expert from Spam Resource explains that when dealing with blocklists, you should first identify why you are listed and then fix the root cause. After the issue is resolved, contact the blocklist and ask for removal, showing them the actions you have taken to prevent future issues.

September 2023 - Spam Resource
Expert view

Expert from Spam Resource emphasizes the importance of list hygiene, advising regular removal of inactive or unengaged subscribers. Maintaining a clean list reduces bounce rates and improves sender reputation, preventing blocklisting.

September 2024 - Spam Resource
Expert view

Expert from Word to the Wise explains that avoiding 'snowshoe spamming' (spreading email volume across many IPs to avoid detection) involves carefully managing IP reputation. Monitor each IP's performance, limit sending volume per IP, and ensure all IPs follow email best practices.

September 2021 - Word to the Wise
Expert view

Expert from Email Geeks says that the “tool” for Google is to send mail that causes your recipients to interact with the mail in ways that tell the machine learning filters this is good and wanted email.

December 2023 - Email Geeks
Expert view

Expert from Email Geeks recommends worrying more about Google's perception of your reputation than SORBS.

October 2023 - Email Geeks

What the documentation says
6Technical articles

Resolving domain blocklisting and improving email reputation relies heavily on understanding and implementing email authentication protocols and monitoring tools. Google's Postmaster Tools provides key insights into sender reputation and spam rates, enabling identification and resolution of deliverability issues. Microsoft recommends avoiding blacklists, implementing SPF, DKIM, and DMARC, and adhering to email content best practices. Spamhaus offers a Blocklist Removal Center to check listing status and removal instructions. SPF allows domain owners to specify authorized mail servers, preventing email forgery. DKIM uses cryptographic signatures to verify senders, improving trust with ISPs. DMARC builds on SPF and DKIM, enabling domain owners to specify actions for failed authentication checks.

Key findings

  • Utilize Postmaster Tools: Google's Postmaster Tools offers valuable data on sending reputation and spam rates.
  • Implement Authentication: SPF, DKIM, and DMARC are crucial for email authentication and preventing spoofing.
  • Check Blocklist Status: Spamhaus's Blocklist Removal Center helps identify listing status and provides removal instructions.
  • SPF Authorization: SPF allows domain owners to authorize specific mail servers.
  • DMARC Control: DMARC allows domain owners to define actions for failed authentication checks.

Key considerations

  • Proactive Monitoring: Regularly monitor your sending reputation and spam rates using available tools.
  • Compliance: Adhering to email content best practices is crucial for avoiding spam filters.
  • Authentication Complexity: Proper implementation of SPF, DKIM, and DMARC requires technical expertise and careful configuration.
  • Holistic Approach: Combining authentication with other deliverability best practices (list hygiene, engagement monitoring) is essential for success.
  • Continuous Adaptation: Email authentication and deliverability strategies may need to be adjusted over time based on evolving ISP policies and spam filtering techniques.
Technical article

Documentation from DKIM.org explains DKIM, an email authentication method that uses cryptographic signatures to verify the sender of an email. Implementing DKIM helps prevent email spoofing and improves deliverability by building trust with ISPs.

April 2023 - DKIM.org
Technical article

Documentation from Spamhaus explains to use their Blocklist Removal Center to check if your IP or domain is listed. If listed, understand the reason and follow their specific instructions for requesting removal after addressing the issue.

May 2021 - Spamhaus
Technical article

Documentation from Google explains that Postmaster Tools provides insights into your sending reputation, spam rate, and other metrics. Use this data to identify and resolve issues affecting deliverability to Gmail users.

April 2024 - Google
Technical article

Documentation from RFC Editor explains SPF, a standard email authentication method, allows domain owners to specify which mail servers are authorized to send emails on behalf of their domain. Implementing SPF helps prevent spammers from forging email addresses, improving deliverability.

February 2024 - RFC Editor
Technical article

Documentation from DMARC.org explains DMARC, an email authentication protocol that builds upon SPF and DKIM to give domain owners more control over how their email is handled. Implementing DMARC allows you to specify what action receiving mail servers should take if an email fails SPF or DKIM checks.

February 2022 - DMARC.org
Technical article

Documentation from Microsoft outlines that to improve email delivery, ensure your sending IPs are not blacklisted, authenticate your email with SPF, DKIM, and DMARC, and follow best practices for email content to avoid being marked as spam.

August 2023 - Microsoft