Why am I getting TSS04 errors from Yahoo and how do I fix it?
Summary
What email marketers say9Marketer opinions
Email marketer from Reddit indicates that TSS04 errors often occur when a new IP address begins sending emails through Yahoo or if the IP hasn't built a good reputation, which can happen through not being verified or lack of engagement. EmailHelpReddit suggests slowing down sending volumes and ensuring a good reputation by checking blacklists.
Email marketer from Mailjet shares that improving sender reputation involves authenticating your email (SPF, DKIM, DMARC), maintaining consistent sending volumes, and segmenting your lists to send relevant content to engaged recipients to reduce complaints.
Email marketer from EmailOversight Blog shares that TSS04 errors are a strong indicator of IP reputation issues with Yahoo! Mail. This means your IP address may be flagged due to spam complaints, low engagement, or being a new IP with limited sending history.
Email marketer from Stack Overflow suggests that the TSS04 error can be a temporary block due to a sudden spike in email sending volume. It is recommended to gradually increase sending volume and monitor email sending practices.
Email marketer from Email Geeks shares TSS04 errors are most common when building reputation on a new IP/domain or if either has a poor reputation. Hassan recommends immediately stopping sending to Yahoo upon receiving a TSS04 error and pausing for at least 4 hours.
Email marketer from Email Geeks indicates that this was a Yahoo issue today only, and if senders are seeing longer issues, it could be related to their mailing practices.
Email marketer from SMTP2GO notes that maintaining a positive IP reputation is key to avoiding issues with Yahoo. To resolve a TSS04 error, it's important to engage with Yahoo's postmaster resources, monitor bounce rates, and adjust sending strategies to adhere to Yahoo's guidelines.
Email marketer from GMass shares that TSS04 means that the connection or IP is blocked due to complaints or other policy reasons. GMass recommends that you stop sending and contact Yahoo to resolve the reason why the IP/Domain is blocked.
Email marketer from Email Geeks shares that TSS04 usually comes due to low reputations of sending IPs and complaints, especially with new IPs. Good engagement and low complaints can resolve the issue.
What the experts say4Expert opinions
Expert from Spam Resource explains that TSS04 errors are Yahoo's code for a temporary block. It usually means Yahoo doesn't like something about your mail stream and is putting you on hold until you fix it. Could be reputation, complaints or blocklist, so stop sending immediately, investigate, and then ease back in once you've resolved the issue.
Expert from Word to the Wise explains that Yahoo TSS04 errors often indicate a temporary block due to sender reputation concerns or policy reasons. Immediate action should involve stopping all mail flow to Yahoo, carefully reviewing recent sending activities, and using tools to check domain and IP reputation.
Expert from Email Geeks explains if you’re still getting TSS04 errors after a pause, your pause wasn’t long enough.
Expert from Email Geeks explains that TSS04 errors are a temporary failure due to reputation issues. Matt recommends pausing queues for a couple of hours and lowering connection limits and delivery rates.
What the documentation says4Technical articles
Documentation from Google shares that to maintain a good reputation it is important to reduce your spam rate to be less than 0.10% and avoid ever reaching 0.30% as this may cause blocking.
Documentation from RFC explains that implementing SPF, DKIM, and DMARC helps to verify the sender's identity and reduce the chance of being marked as spam, improving sender reputation and potentially reducing TSS04 errors.
Documentation from Verizon Media Postmaster explains that a TSS04 error indicates a temporary problem where Yahoo! Mail is unable to accept mail from your sending IP address due to reputation concerns. This might be triggered by low IP reputation, a high complaint rate, or other factors impacting sender reputation.
Documentation from SparkPost explains that while not specifically addressing TSS04, temporary delivery failures often result from reputation-based blocking. Immediate actions include pausing sending, reviewing sending practices for compliance, and ensuring proper authentication protocols are in place.