Summary
The Yahoo TSS06 error is a temporary deferral indicating potential spam or unusual sending patterns. It can be triggered by volume spikes, poor sender reputation, sending to spam traps, low engagement rates, or issues with email authentication. Maintaining good list hygiene, providing clear unsubscribe options, implementing feedback loops, testing content, separating email streams, and monitoring sender reputation are essential for prevention. Some reports suggest the error could be related to Yahoo-side issues.
Key findings
- TSS06 Definition: The TSS06 error indicates a temporary block due to potential spam or unusual sending patterns.
- Volume Spikes: Sudden increases in sending volume, especially with a new IP, can trigger the error.
- Sender Reputation: A negative sender reputation increases the likelihood of the error.
- List Quality: Sending to a list with many invalid or inactive addresses causes TSS06 errors.
- Engagement: Low engagement rates can result in the error.
- Authentication: Improper email authentication (SPF, DKIM, DMARC) contributes to delivery issues.
- Yahoo-Side Issues: In some cases, the error may stem from Yahoo's infrastructure or policies.
Key considerations
- List Hygiene: Regularly clean email lists using double opt-in to remove invalid or inactive addresses.
- Gradual Volume: Gradually increase sending volume, particularly when starting with a new IP.
- Sender Authentication: Ensure proper configuration of SPF, DKIM, and DMARC records.
- Engagement Content: Focus on providing valuable content that encourages recipient engagement.
- Unsubscribe: Provide clear unsubscribe options to avoid spam complaints.
- Feedback Loops: Implement feedback loops with ISPs to monitor and address spam complaints.
- Email Testing: Test email content with spam filter simulators before sending.
- Stream Separation: Separate transactional and marketing email streams to protect deliverability.
- Monitor Reputation: Use tools like Google Postmaster Tools and Microsoft SNDS to monitor sender reputation.
- Headers: Include proper headers like List-Unsubscribe and Content-Type.
What email marketers say
9 marketer opinions
The Yahoo TSS06 bounce error is often triggered by factors such as sudden sending volume spikes, poor sender reputation, sending practices resembling spam, or technical issues such as incorrect email authentication. Maintaining good list hygiene, separating email streams, providing easy unsubscribe options, implementing feedback loops, and testing email content are all crucial for prevention. It may also indicate an issue on Yahoo's side.
Key opinions
- Volume Spikes: Sudden increases in email sending volume can trigger the TSS06 error, particularly for senders with an unestablished reputation.
- Sender Reputation: A poor sender reputation increases the likelihood of encountering the TSS06 error, potentially flagging senders as spammers.
- Spam-like Practices: Sending practices that resemble spamming or exceeding sending limits can result in Yahoo throttling senders with the TSS06 error.
- Authentication Issues: Incorrectly configured or missing email authentication (SPF, DKIM, DMARC) can lead to deliverability problems, including the TSS06 error.
- Yahoo Issue: The error might stem from issues on Yahoo's side, indicated by consistent resolutions following contact with Yahoo Postmaster.
Key considerations
- List Hygiene: Regularly clean email lists to remove inactive or invalid addresses, reducing bounce rates and spam flagging risks.
- Unsubscribe Options: Provide clear and easy-to-use unsubscribe options to minimize spam complaints.
- Feedback Loops: Implement feedback loops with ISPs like Yahoo to address and resolve spam complaints promptly.
- Content Testing: Use spam filter simulation tools to test email content proactively and identify potential issues.
- Stream Separation: Separate transactional and marketing email streams to prevent marketing campaigns from affecting deliverability of critical transactional messages.
- Gradual Volume Increase: Gradually increase sending volume to avoid triggering spam filters, especially when starting with a new IP or domain.
Marketer view
Email marketer from Litmus emphasizes the importance of providing clear unsubscribe options in every email. Making it easy for recipients to unsubscribe reduces the likelihood of them marking your emails as spam.
17 Sep 2024 - Litmus
Marketer view
Email marketer from StackOverflow suggests that Yahoo may be using the TSS06 error to throttle senders that are exceeding sending limits or engaging in practices that resemble spamming. He recommends checking for compromised accounts that might be sending spam without your knowledge.
9 Jan 2025 - StackOverflow
What the experts say
2 expert opinions
The Yahoo TSS06 error can be caused by sending to lists with poor quality (high numbers of invalid/inactive addresses) and/or by low engagement rates. Regular list cleaning, using double opt-in, and focusing on providing valuable, engaging content are recommended.
Key opinions
- List Quality: Sending to lists with many invalid or inactive email addresses is a frequent cause of the TSS06 error.
- Engagement Rates: Low engagement rates can also trigger the Yahoo TSS06 error.
Key considerations
- Regular List Cleaning: Clean your email lists regularly to remove invalid or inactive addresses.
- Double Opt-in: Use double opt-in to ensure the quality of your email list.
- Valuable Content: Focus on providing valuable content that recipients want to engage with.
- Improve Engagement: Work to improve engagement metrics to reduce the likelihood of triggering the error.
Expert view
Expert from Word to the Wise advises that Yahoo's TSS06 error can stem from low engagement rates. They suggest focusing on providing valuable content that recipients want to interact with, thus boosting engagement metrics and reducing the likelihood of triggering the error.
20 May 2024 - Word to the Wise
Expert view
Expert from Spam Resource emphasizes that a frequent cause of the TSS06 error is sending to a list with a high number of invalid or inactive email addresses. They recommend cleaning lists regularly and using double opt-in to ensure list quality.
16 Mar 2024 - Spam Resource
What the documentation says
6 technical articles
The Yahoo TSS06 error is a temporary deferral indicating potential spam or unusual sending patterns from a specific IP. Blocks are triggered by sending to spam traps, recipient complaints, or a negative sender reputation. Maintaining a positive sender reputation is crucial, and can be monitored through tools like Google Postmaster Tools and Microsoft SNDS. Proper email headers, such as List-Unsubscribe and Content-Type, are essential for signaling legitimacy.
Key findings
- TSS06 Definition: TSS06 is a temporary deferral error from Yahoo, indicating a possible spam issue or unusual sending patterns from a specific IP address.
- Spam Traps and Complaints: Sending to spam traps or receiving spam complaints can trigger IP blocks and negatively impact sender reputation.
- Sender Reputation: A positive sender reputation is critical for avoiding filtering and bounces.
- Policy-Based Deferral: 5.7.x errors, including TSS06, often indicate policy-based deferrals on the recipient's side (Yahoo).
Key considerations
- Monitor Reputation: Use tools like Google Postmaster Tools and Microsoft SNDS to monitor the health and reputation of your sending IPs.
- Proper Headers: Include proper email headers, such as `List-Unsubscribe` and `Content-Type`, to signal legitimacy to ISPs.
- Avoid Spam Traps: Implement practices to avoid sending to spam traps, such as using double opt-in and regularly cleaning your email lists.
- Reduce Complaints: Ensure your emails are relevant and provide value to reduce the likelihood of recipients marking them as spam.
Technical article
Documentation from RFC 5321 details that 5.7.x errors generally indicate permanent delivery failure due to policy reasons on the recipient's side, aligning with Yahoo's use of TSS06 for policy-based deferrals.
19 May 2022 - RFC Editor
Technical article
Documentation from AWS SES states that including proper headers, such as `List-Unsubscribe` and `Content-Type`, in every email is crucial for signaling legitimacy and helping ISPs filter messages correctly.
23 Jan 2022 - Amazon Web Services
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