421 4.7.0 [TS02]
TS02 Complaint Rate Deferral
Mail is paused because Yahoo is seeing a spike in spam complaints.
TS02 reflects a trust downgrade driven by recent complaint or unsubscribe activity. Yahoo slows delivery so recipients are not overwhelmed.
Severity
WARNING
Provider
Yahoo Mail
Reference
TS02
Last Reviewed
2025-06-01
How to Fix 421 4.7.0 [TS02]
Follow these steps to resolve this Yahoo Mail SMTP error and restore normal delivery.
- ✓Suppress unengaged contacts who have not opened in the past 90 days.
- ✓Verify list acquisition sources and drop any third-party data.
- ✓Highlight the unsubscribe link and confirm it works within one click.
- ✓Pause campaigns that triggered the spike until reputation rebounds.
Helpful Resources
More Yahoo Mail SMTP Codes
Keep these related troubleshooting guides handy while addressing 421 4.7.0 [TS02].
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