Summary
The TSS11 error from Yahoo indicates a permanent deferral due to concerns about sending practices, content, or sender reputation. This often points to spam identification, policy violations, or authentication failures (SPF/DKIM). Key causes include recent changes (new lists, different content, compromised accounts/domains), sudden increases in volume, poor list hygiene (spam traps, unengaged users), blocklisting, low engagement, and high complaint rates. Resolution involves contacting Yahoo postmaster support, reviewing sending practices, checking blocklists, improving sender reputation, addressing complaints, throttling volume, ensuring proper authentication, and implementing feedback loops.
Key findings
- Underlying Issues: TSS11 signifies problems with sender reputation, content filtering, authentication (SPF/DKIM), or a combination thereof.
- Action Needed: Yahoo's TSS11 error often suggests that Yahoo identified email as SPAM or has an issue with it. Thus, you must reach out to the Postmaster team.
- Recent Changes: Changes in the past week or two like to sending practices, lists, content, or account security trigger TSS11 errors.
- List Hygiene: Poor list quality is often a contributor to high rates of invalid and spam emails.
- Authentication and Policies: The message might not meet content standards due to strict DMARC enforcement. Thus, DMARC, DKIM, and SPF standards should be validated.
Key considerations
- Engage Yahoo Postmaster: Contact Yahoo's postmaster team to understand the specific reason for the TSS11 error.
- Review Outbound Traffic: Check all outbound traffic from the IP as far back as a week or two to identify bad actors or compromised devices
- Address Complaints: If recieving a high volume of complaints, fix the issue quickly so the error does not continue to be an issue.
- Improve Reputation: Improve sender reputation by consistent volume, low complaint rates, and valid authentication of emails.
- List Maintenance: Regularly engage with users to clean lists, and to check that the emails are still valid and good.
What email marketers say
9 marketer opinions
The TSS11 error from Yahoo indicates a permanent deferral of emails from a specific IP address, signaling serious concerns about sending practices, content, or sender reputation. Common causes include spam identification, policy violations, sudden increases in email volume, changes in content triggering spam filters, blocklisting, poor sender reputation, low engagement, high complaint rates, and sending too many emails in a short timeframe. Resolution often involves contacting Yahoo postmaster support, reviewing email campaigns, checking blocklists, improving sender reputation, addressing complaints, throttling sending volume, and ensuring proper email authentication.
Key opinions
- Root Cause: TSS11 indicates Yahoo has serious concerns about your sending practices or content originating from your IP address.
- Contact Support: Contacting Yahoo postmaster support is crucial for understanding the specific reason and resolving the issue.
- Sending Practices: Sudden increases in email volume or changes in content can trigger Yahoo's spam filters.
- Sender Reputation: Poor sender reputation, low engagement, and high complaint rates contribute to TSS11 errors.
- Blocklisting: Being listed on a blocklist can lead to delivery issues, including TSS11 errors.
Key considerations
- Review Campaigns: Thoroughly review recent email campaigns and sending practices for potential issues.
- Check Blocklists: Use tools to check if your IP address is on any email blocklists.
- Improve Reputation: Focus on improving sender reputation through consistent sending volume, low complaint rates, and proper email authentication.
- Address Complaints: Monitor and address email complaints promptly to prevent further issues.
- Throttle Volume: Consider throttling email sending volume, especially if sending large batches.
- Implement Authentication: Ensure that your SPF and DKIM records are properly configured to demonstrate legitimacy.
Marketer view
Email marketer from Stack Overflow shares that TSS11 usually means Yahoo has identified your email server IP as a source of spam, or your sending practices violate their policies. You need to contact Yahoo postmaster support to resolve this.
31 Dec 2024 - Stack Overflow
Marketer view
Email marketer from Mailjet states that a poor sender reputation can trigger TSS11 errors. Improving sender reputation involves consistent sending volume, low complaint rates, and proper email authentication.
30 Jun 2024 - Mailjet Blog
What the experts say
3 expert opinions
The TSS11 error from Yahoo indicates issues with sending reputation, content filtering, authentication (SPF/DKIM), or a combination thereof. Recent changes like new lists, different content, compromised accounts/domains, or poor list hygiene (spam traps, unengaged users) are potential causes. Direct investigation with Yahoo's postmaster team, along with feedback loops and complaint processing, is crucial for resolution.
Key opinions
- Underlying Issues: TSS11 errors often stem from sender reputation problems, content filtering, or authentication failures (SPF/DKIM).
- Recent Changes: Changes to sending practices, lists, content, or account security can trigger TSS11 errors.
- List Hygiene: Poor list hygiene (spam traps, unengaged users) can contribute to TSS11 errors.
Key considerations
- Investigate with Yahoo: Engage with Yahoo's postmaster team to identify the specific cause of the TSS11 error.
- Review Recent Activity: Carefully examine any recent changes to sending practices, email lists, content, or account security.
- Improve List Quality: Implement strategies for maintaining a clean email list, including removing spam traps and unengaged users.
- Implement Feedback Loops: Make sure feedback loops and processes are in place for complaint processing
Expert view
Expert from Word to the Wise says that if Yahoo is blocking mail with a TSS11 error, it is critical to double-check list hygiene, ensure you are not sending to spam traps or unengaged users, and to have feedback loops and complaint processing in place. Often these types of errors point to sudden increases in sending to bad email addresses.
7 Jul 2024 - Word to the Wise
Expert view
Expert from Email Geeks explains that something must have changed recently, such as a new list, different content, compromised domain, or compromised account. Suggests reviewing changes in the week or two before the bounces started.
9 Jul 2023 - Email Geeks
What the documentation says
4 technical articles
The TSS11 error, often represented by the 5.7.2 enhanced mail system status code, indicates that Yahoo is rejecting messages due to content policy violations, abusive sending patterns (such as sending to invalid addresses/spam traps), or failures in email authentication (SPF/DKIM) potentially related to strict DMARC enforcement. Reviewing list hygiene and ensuring correct SPF/DKIM configurations are key.
Key findings
- Content & Policy: TSS11 and the 5.7.2 status code suggest that the email content or sending practices violate Yahoo's policies.
- Abusive Sending: Yahoo detects potentially abusive patterns, like sending to invalid or spam-trapped email addresses.
- Authentication Failure: Incorrect or missing SPF/DKIM records may cause delivery issues, especially with strict DMARC policies in place.
Key considerations
- Review List Hygiene: Implement and enforce strict list hygiene practices to avoid sending to invalid or spam-trapped addresses.
- Check SPF/DKIM: Verify that SPF and DKIM records are correctly configured to ensure proper email authentication.
- DMARC Compliance: Ensure that DMARC policies are properly configured and that emails pass authentication checks to avoid rejection.
- Review Content: Carefully evaluate email content to ensure it meets current content standards.
Technical article
Documentation from SparkPost explains that a TSS11 error often means that Yahoo's systems have detected a pattern of behavior that they consider abusive, such as sending to a large number of invalid or spam-trapped email addresses. Review your list hygiene practices.
12 Dec 2024 - SparkPost Documentation
Technical article
Documentation from RFC Editor explains that 5.7.2 Enhanced Mail System Status Code indicates delivery was refused because the message's content did not meet standards or because of other content or policy reasons.
8 May 2024 - RFC 5248
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