450 4.7.1
SFR_IN_101 Spam Complaints
SFR detected too many spam complaints and blocked the IP for two hours.
SFR_IN_101 is triggered when subscribers mark excessive messages as spam. The block affects all SFR brands (sfr.fr, neuf.fr, numericable.fr).
Severity
ERROR
Provider
SFR
Reference
SFR_IN_101
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.
- ✓Pause SFR traffic and remove unengaged or purchased lists immediately.
- ✓Review Signal Spam feedback loop reports for complaint trends.
- ✓Slow the send rate and resume with high-engagement cohorts first.
- ✓Audit creative, frequency, and consent sources before ramping back up.
Helpful Resources
More SFR SMTP Codes
Keep these related troubleshooting guides handy while addressing 450 4.7.1.
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