450 4.7.1
SFR_IN_106 Too Many Messages per Recipient
The IP sent too many messages to the same recipient or group within a short interval.
SFR monitors per-user frequency. Automated testing or transactional retries can look like abuse and trigger SFR_IN_106.
Severity
WARNING
Provider
SFR
Reference
SFR_IN_106
Last Reviewed
2025-06-01
How to Fix 450 4.7.1
Follow these steps to resolve this SFR SMTP error and restore normal delivery.
- ✓Implement per-user frequency caps for SFR addresses.
- ✓Stagger transactional retries instead of retrying instantly.
- ✓Group low-importance alerts into digests rather than multiple sends.
- ✓Educate support teams to avoid repeated resends to the same mailbox.
Helpful Resources
More SFR SMTP Codes
Keep these related troubleshooting guides handy while addressing 450 4.7.1.
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