Yahoo Mail 554 5.7.1 [TS06]: sender reputation block.

Yahoo blocked the message because the sender reputation remains too low.

How to fix 554 5.7.1 [TS06].

Retrying or final
Final
A 5xx reply. The server will not accept this message. Resending it unchanged fails again.
Who is at fault
Sender
Your authentication, reputation, content, or sending pace.
Severity
ErrorPermanent Block
Permanent554 5.7.1 [TS06]

TS06 is typically issued after repeated TS02 or TS03 warnings. Yahoo expects proof that complaint and bounce levels are under control.

Next steps

  1. 1Pause Yahoo sends and tackle complaint, bounce, and trap metrics.
  2. 2Ensure no secondary systems or compromised accounts are sending mail.
  3. 3Share remediation steps with Yahoo before requesting reinstatement.
  4. 4Reintroduce traffic with a small, high-engagement cohort once cleared.
Yahoo Mail documentationEvery raw SMTP 554 reply

The same code at other providers.

Providers word the same code differently. Their fixes differ too.

554 5.7.1 [HME1]Apple Mail (iCloud)Authentication failureFinal
554 5.7.1Apple Mail (iCloud)DMARC failureFinal
554 5.7.1 [CS02]Apple Mail (iCloud)Phishing or spoofing contentFinal
554 5.7.1 [CS03]Apple Mail (iCloud)Suspicious attachment or linkFinal
554 5.7.1 [HM08]Apple Mail (iCloud)Local policy blockFinal

More Yahoo Mail codes.

Full Yahoo Mail playbook

Other Yahoo Mail fixes

421 4.7.0 [TS02]Complaint rate deferralRetrying
421 4.7.0 [TS03]Reputation holdRetrying
421 4.7.0 [TS01]New or cold IP throttleRetrying
421 4.7.0 [TSS04]Temporary deferralRetrying
451Unresolvable from domainRetrying
554Unresolvable from domainFinal

In the glossary

Bounce (Hard)Hard bounce is when an email cannot be delivered because the address is invalid or blocked. It is a permanent failure and the address should be removed from your list.
Suppression ListA suppression list is the place your email tool keeps addresses that should not receive messages. It is a permanent "do not send" list that helps you avoid emailing people who have opted out or caused issues in the past.
List HygieneList hygiene is the practice of cleaning your email list by removing bad or inactive addresses. It keeps your list focused on people who still want your emails.
Bounce RateBounce rate is the percentage of emails that could not be delivered to recipients. It shows how many addresses are invalid or blocked compared to the total you tried to send.

Browse all raw Yahoo Inc replies →

More references.

SMTP field manual.

Every SMTP reply code, with real bounces from mailbox providers and spam filters and who needs to act.

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