How many spam traps are normal to hit with transactional emails and how to troubleshoot Microsoft deliverability issues?

Summary

Experts and documentation agree that minimizing spam trap hits is critical for email deliverability. While some suggest 1-2 spam traps per month on transactional emails with confirmed opt-in may be acceptable, all hits should be investigated. Key actions for troubleshooting Microsoft deliverability issues include maintaining a clean email list through opt-in procedures, regular cleaning, and email verification; authenticating emails with SPF, DKIM, and DMARC; monitoring sender reputation using Microsoft SNDS and other tools; focusing transactional emails on value; warming up new IPs; and addressing block list issues. Understanding the difference between pristine and recycled spam traps helps identify the root cause of list problems. Reviewing the Sender Reputation Data page in Microsoft 365 Defender portal, analyzing bounce codes and feedback loops, and following Google's bulk sender guidelines are also essential.

Key findings

  • Spam Trap Minimization: Aim for zero spam trap hits, but investigate any occurrences.
  • List Hygiene is Key: Clean and up-to-date email lists are crucial for deliverability.
  • Authentication Matters: Implement SPF, DKIM, and DMARC for email authentication.
  • Monitor Sender Reputation: Regularly monitor your sender reputation using Microsoft SNDS and other tools.
  • Transactional Content: Focus transactional emails on providing value to the customer.
  • Microsoft Tools: Utilize Microsoft 365 Defender portal for troubleshooting and SNDS for reputation monitoring.

Key considerations

  • Confirmed Opt-in: Use confirmed opt-in processes to build a clean and engaged list.
  • Email Verification: Use email verification services to remove invalid and harmful addresses.
  • IP Warm-up: Gradually warm up new IPs to build a positive sending reputation.
  • SNDS Monitoring: Actively monitor Microsoft SNDS for deliverability issues.
  • Blocklist Removal: Address any block list issues promptly.
  • Differentiate Pristine vs Recycled: Understand the difference between pristine and recycled spam traps to address the correct underlying problem.
  • Review Defender Data: Consult the Sender Reputation Data page in Microsoft 365 Defender to understand block reasons and take steps to remove blocks.

What email marketers say
10Marketer opinions

The consensus from email marketing experts is that *any* number of spam trap hits is too many and indicates serious issues with list hygiene or acquisition practices. To troubleshoot Microsoft deliverability issues, it's crucial to maintain a clean email list by employing strict opt-in procedures, regularly removing inactive subscribers, and using email verification services. Authenticating emails with SPF, DKIM, and DMARC is essential, as is monitoring your sender reputation using tools like Microsoft SNDS. Transactional emails should focus on delivering value and avoid promotional content. Gradually warming up new IPs and domains is also recommended. If blocked, check blacklists and contact Microsoft support.

Key opinions

  • Spam Traps = Bad: Even a single spam trap hit can negatively impact your sender reputation and deliverability.
  • Clean Lists: Maintaining a clean email list is crucial for avoiding spam traps and improving deliverability.
  • Authentication: Email authentication (SPF, DKIM, DMARC) is essential for verifying your emails and preventing spoofing.
  • SNDS Monitoring: Microsoft's SNDS is a valuable tool for monitoring your domain's reputation and identifying deliverability issues.
  • Transactional Focus: Transactional emails should focus on delivering value and avoid promotional content.

Key considerations

  • Opt-in Procedures: Implement strict opt-in procedures to ensure subscribers are genuinely interested in receiving your emails.
  • List Hygiene: Regularly remove inactive subscribers and invalid email addresses from your list.
  • IP Warmup: Gradually warm up new IP addresses and domains to build a positive sending reputation.
  • Blacklist Checks: If experiencing deliverability issues, check blacklists and work to get your IP removed if listed.
  • Contact Microsoft: If blocked by Microsoft, contact their support team to inquire about the block and request assistance.
Marketer view

Email marketer from StackOverflow shares that transactional emails should focus on delivering value to the customer, like order confirmations and password resets. Sending promotional content in transactional emails can confuse filters and negatively impact deliverability. Ensure transactional emails are properly authenticated with SPF, DKIM, and DMARC.

July 2021 - StackOverflow
Marketer view

Email marketer from Reddit shares that, if you're experiencing deliverability problems with Microsoft, check your domain's reputation using Microsoft's SNDS (Smart Network Data Services). This tool can provide insights into your sending reputation and any potential issues Microsoft is seeing with your email traffic.

March 2023 - Reddit
Marketer view

Email marketer from Litmus Blog explains the importance of email authentication protocols (SPF, DKIM, and DMARC) to improve deliverability. These protocols help verify that your emails are legitimate and prevent spoofing. Implement these protocols to build trust with email providers and avoid being marked as spam.

February 2024 - Litmus Blog
Marketer view

Email marketer from Gmass Blog recommends warming up new IP addresses and domains to gradually build a positive sending reputation. Start with small sending volumes and gradually increase them over time. This helps email providers recognize your sending patterns as legitimate and avoid marking your emails as spam.

June 2024 - Gmass Blog
Marketer view

Email marketer from EmailDeliverability.com Forum shares that Microsoft often blocks IP ranges if they detect spam-like behavior. Check your IP reputation on services like Talos Intelligence and Spamhaus. If your IP is listed on a blacklist, work to get it removed. Also, contact Microsoft support to inquire about the block and request assistance.

February 2022 - EmailDeliverability.com Forum
Marketer view

Email marketer from Mailjet Blog explains that hitting even a single spam trap can significantly damage your sender reputation, leading to deliverability issues. They emphasize the importance of maintaining a clean email list and avoiding spam traps altogether.

August 2024 - Mailjet Blog
Marketer view

Email marketer from HubSpot Blog emphasizes the significance of maintaining a good sender reputation to ensure email deliverability. Monitor your sender score using tools like Sender Score or ReputationAuthority. Implement best practices such as sending relevant content, providing easy unsubscribe options, and avoiding spam triggers to improve your sender reputation.

January 2023 - HubSpot Blog
Marketer view

Email marketer from SendGrid Blog explains that avoiding spam traps involves employing strict opt-in procedures, regularly cleaning your email lists to remove inactive or invalid addresses, and monitoring bounce rates to identify potential problems early on. They state that even a small number of spam trap hits can negatively impact deliverability.

March 2023 - SendGrid Blog
Marketer view

Email marketer from EmailOnAcid Blog shares that list hygiene is crucial to avoiding spam traps and maintaining good deliverability. Regularly remove inactive subscribers and invalid email addresses from your list. Implement a double opt-in process to ensure subscribers are genuinely interested in receiving your emails.

November 2021 - EmailOnAcid Blog
Marketer view

Email marketer from ZeroBounce Blog stresses the importance of using an email verification service to identify and remove invalid, inactive, and potentially harmful email addresses from your list. This helps you avoid spam traps, reduce bounce rates, and improve your overall deliverability.

April 2023 - ZeroBounce Blog

What the experts say
7Expert opinions

Experts suggest that 1-2 spam traps per month on a transactional stream with Confirmed Opt-In (COI) might be acceptable, but hitting any spam trap warrants investigation. Delivery issues can arise on COI IPs due to handling 'bad' mail and lacking sufficient 'good' traffic. To improve deliverability, remind users to check spam folders and move emails to the inbox. Distinguish between blocking and spamfoldering as fixes vary. Microsoft's SNDS is crucial for monitoring IP reputation and spam complaints. Pristine spam traps indicate list acquisition problems, while recycled traps signal poor list hygiene.

Key opinions

  • Acceptable Trap Rate: 1-2 spam traps/month on COI transactional streams may be acceptable.
  • COI IP Issues: COI IPs can experience delivery problems due to traffic characteristics.
  • Diagnosis Crucial: Blocking and spamfoldering require different troubleshooting approaches.
  • SNDS Importance: Microsoft SNDS is essential for monitoring IP reputation.
  • Trap Type Matters: Pristine and recycled spam traps indicate different problems.

Key considerations

  • Spam Folder Reminder: Remind users to check their spam folders.
  • Identify Block Reason: Get the specific block message to understand the problem.
  • Investigate All Traps: Even a small number of spam trap hits requires investigation.
  • Monitor SNDS: Regularly monitor Microsoft's SNDS for deliverability issues.
  • List Acquisition: Ensure proper list acquisition practices to avoid pristine spam traps.
Expert view

Expert from Email Geeks suggests reminding users at signup to check their spam folder and move the email to the inbox to send a strong signal.

December 2021 - Email Geeks
Expert view

Expert from Email Geeks explains that 1-2 spam traps a month on a transactional stream with COI isn't a huge deliverability problem and is considered normal or even low.

May 2023 - Email Geeks
Expert view

Expert from Email Geeks shares that delivery problems sometimes occur on COI IPs because they handle "bad" mail collection and lack consistent "good" traffic to balance it.

April 2022 - Email Geeks
Expert view

Expert from Spamresource.com explains that there are different kinds of spam traps (pristine and recycled). Pristine spam traps never signed up for emails, so hitting these indicates a serious list acquisition problem. Recycled spam traps are old addresses that have been converted into traps, which suggests poor list hygiene. Hitting any spam trap, even a small number, is bad and requires immediate investigation.

May 2024 - Spamresource.com
Expert view

Expert from Email Geeks explains that fixes differ for blocking versus spamfoldering, making clarification the initial step.

January 2023 - Email Geeks
Expert view

Expert from Wordtothewise.com shares that Microsoft's Smart Network Data Services (SNDS) is a valuable tool for identifying and addressing deliverability issues with Hotmail, Outlook, and other Microsoft properties. SNDS can provide data on your IP reputation, spam complaint rates, and other factors that affect deliverability. Regularly monitor SNDS to identify and resolve any problems before they impact your sending reputation.

September 2021 - Wordtothewise.com
Expert view

Expert from Email Geeks suggests getting the block message from Braze, as it may contain useful information for finding a solution.

November 2023 - Email Geeks

What the documentation says
5Technical articles

Troubleshooting Microsoft deliverability issues involves checking the Sender Reputation Data page in the Microsoft 365 Defender portal for blocks and addressing common spam causes like poor list hygiene. Following Google's bulk sender guidelines, such as email authentication, low spam rates, and easy unsubscription, improves deliverability across providers. Analyze bounce codes and feedback loops, monitor engagement metrics, and implement SPF, DKIM, and DMARC for authentication. Utilizing Microsoft's Enhanced Email features can also help build trust and reduce spam markings.

Key findings

  • Defender Portal: Microsoft 365 Defender portal's Sender Reputation Data page is key for initial troubleshooting.
  • Google Guidelines: Following Google's bulk sender guidelines benefits deliverability with Microsoft too.
  • Bounce Codes & Feedback: Analyzing bounce codes and feedback loops provides insights into delivery failures.
  • Email Authentication: SPF, DKIM, and DMARC are vital for email authentication and preventing spam flags.
  • Enhanced Email: Microsoft's Enhanced Email helps build trust and reduce spam markings.

Key considerations

  • Check Block Lists: Verify if your domain or IP is on Microsoft's block list.
  • Address Spam Causes: Rectify common issues that lead to emails being marked as spam, such as poor list hygiene.
  • Monitor Engagement: Closely observe engagement metrics like open rates to identify potential issues.
  • Consistent Practices: Maintain consistent sending practices and adhere to best practices.
  • Unsubscribe Options: Provide easy and clear unsubscribe options to reduce spam complaints.
Technical article

Documentation from SparkPost explains that to troubleshoot deliverability problems, examine bounce codes and feedback loops. These provide information on why emails are not being delivered. Also, closely monitor engagement metrics to identify any trends that might indicate deliverability issues, such as declining open rates.

May 2023 - SparkPost Documentation
Technical article

Documentation from Microsoft Docs shares that to troubleshoot deliverability issues, start by reviewing the Sender Reputation Data page in the Microsoft 365 Defender portal. Check if your domain or IP address is listed as blocked. If so, follow the instructions to request removal from the block list. Also, check the common causes of email being marked as spam, such as poor list hygiene or content issues.

April 2023 - Microsoft Docs
Technical article

Documentation from Google Postmaster Tools shares that while it's focused on Gmail, following Google's bulk sender guidelines can improve deliverability across various email providers, including Microsoft. These guidelines include authenticating your email, maintaining a low spam rate, and providing easy unsubscription options. They emphasize the importance of consistent sending practices.

August 2022 - Google Postmaster Tools
Technical article

Documentation from RFC details the specifications for SPF, DKIM, and DMARC email authentication methods. Using these methods allows email providers to verify you are who you say you are which helps improve your deliverability rates by reducing the chances of being flagged as spam.

November 2021 - RFC Documentation
Technical article

Documentation from Microsoft details what Enhanced Email is and how to set it up. Using this allows you to further customise emails and helps you build your brand trust with customers which in turn reduces your changes of being marked as a phishing attempt and reduces the spam mark rate.

June 2023 - Microsoft Documentation