What does Yahoo TSS04 deferred status mean for email senders?
Summary
What email marketers say6Marketer opinions
Email marketer from Litmus suggests that Yahoo deferred statuses such as TSS04, may relate to both content and reputation and shares you need to examine both. They suggest senders check that they have appropriate authentication, their content isn't triggering any spam filters and ensure their IP address and domain reputation are in good standing.
Email marketer from Email on Acid highlights that TSS04 errors from Yahoo indicate potential deliverability issues that needs investigation. They advise checking sender reputation, ensuring proper authentication (SPF, DKIM, DMARC) and looking for spam triggers in email content.
Email marketer from Reddit shares that TSS04 usually means Yahoo doesn't like something about your email - either the content, your sending IP, or the volume. They suggest checking your IP reputation against blacklists and ensuring your emails aren't triggering spam filters.
Email marketer from Mailjet explains that Yahoo TSS04 errors mean that Yahoo is temporarily refusing messages from the sending IP address. It shares it could be triggered by various factors including sender reputation, content issues, or high sending volume. It recommends checking the sender's reputation, authenticating emails correctly (SPF, DKIM, DMARC), and reviewing content for spam triggers.
Email marketer from GMass explains that it's important to fix deferred errors quickly. Whilst they don't mention TSS04, they share deferred emails are a bad thing. They suggest that to fix deferrals you need to check the main things such as authentication, content and reputation.
Email marketer from Stack Overflow shares that Yahoo email deferrals, likely including TSS04, are often due to reputation. They recommend warming up new IPs slowly and monitoring your sending reputation closely. They also shared that you should ensure your reverse DNS is setup correctly and that your IPs aren't listed on any blacklists.
What the experts say4Expert opinions
Expert from Spam Resource shares that a TSS04 error typically suggests that Yahoo is experiencing problems accepting your mail. He shares to investigate the cause and to fix it urgently.
Expert from Word to the Wise shares that Yahoo's error TSS04 means the mail is going to bulk and the sender needs to investigate. They share that if the mail keeps going to bulk without complaints then Yahoo increases the escalation to TSS04.
Expert from Email Geeks explains that TSS04 is an escalation indicating that mail has been going to the bulk folder for an extended period without complaints.
Expert from Email Geeks shares that Yahoo's infrastructure change led to a reverse escalation process (4-3-2-1) and a change in notation (TSS instead of TS).
What the documentation says4Technical articles
Documentation from Yahoo Postmaster Tools explains that a TSS04 error indicates a temporary issue, often related to reputation or sending volume. It suggests reviewing sending practices and ensuring compliance with Yahoo's guidelines to resolve the issue.
Documentation from Microsoft SNDS explains that it can be used to monitor email IP reputation. While it doesn't mention TSS04 directly it's information that can be used to resolve any issues with deferrals.
Documentation from Amazon SES explains deferred emails as temporary delivery failures, often due to the recipient server being temporarily unavailable or refusing the message due to reputation or policy reasons. Although it does not specifically address TSS04 it provides general information on deferrals.
Documentation from SparkPost explains that Yahoo's TSS04 error signifies a temporary block or deferral due to potential policy violations or reputation concerns. It advises senders to monitor their sending reputation, comply with Yahoo's policies, and ensure proper email authentication is in place.