554 5.7.1 [HM08]
HM08 Local Policy Block
Apple blocked the message after detecting suspicious sending behaviour.
HM08 is commonly associated with list hygiene issues or aggressive send speeds. It is Apple’s signal to slow down and review best practices.
Severity
ERROR
Provider
Apple Mail (iCloud)
Last Reviewed
2025-06-01
How to Fix 554 5.7.1 [HM08]
Follow these steps to resolve this Apple Mail (iCloud) SMTP error and restore normal delivery.
- ✓Check for sudden jumps in send volume or frequency.
- ✓Remove chronically inactive Apple recipients from bulk drops.
- ✓Refresh consent for older lists and honour unsubscribes immediately.
- ✓Share corrective actions with Apple support when requesting a review.
Helpful Resources
More Apple Mail (iCloud) SMTP Codes
Keep these related troubleshooting guides handy while addressing 554 5.7.1 [HM08].
Still experiencing Apple Mail (iCloud) delivery issues?
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