421 OFR004_105
OFR004_105 Service Refused
Orange temporarily refused mail because of a short-lived policy or capacity issue.
OFR004_105 is a soft block. Orange expects senders to slow down and retry later rather than hammer the connection.
Severity
WARNING
Provider
Orange
Reference
OFR004_105
Last Reviewed
2025-06-01
How to Fix 421 OFR004_105
Follow these steps to resolve this Orange SMTP error and restore normal delivery.
- ✓Retry with exponential backoff (15–30 minutes between attempts).
- ✓Review complaint, bounce, and trap metrics for spikes that might degrade reputation.
- ✓Ensure authentication passes; policy failures often precede OFR006 hard blocks.
- ✓Contact Orange support only after confirming the issue is not on your side.
Helpful Resources
More Orange SMTP Codes
Keep these related troubleshooting guides handy while addressing 421 OFR004_105.
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