550 5.7.1
Spamhaus SBL Block
Apple blocked the message because the sending IP is listed on Spamhaus SBL.
Apple honours Spamhaus listings. Until the IP is delisted, Apple will refuse the traffic.
Severity
CRITICAL
Provider
Apple Mail (iCloud)
Last Reviewed
2025-06-01
How to Fix 550 5.7.1
Follow these steps to resolve this Apple Mail (iCloud) SMTP error and restore normal delivery.
- ✓Check the IP at https://check.spamhaus.org and identify the listing reason.
- ✓Remove the abusive stream or compromised system that caused the listing.
- ✓Submit a delisting request with full remediation details once the problem is fixed.
- ✓Route Apple traffic through clean infrastructure until the listing is cleared.
Helpful Resources
More Apple Mail (iCloud) SMTP Codes
Keep these related troubleshooting guides handy while addressing 550 5.7.1.
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