ONLINE
Deliverability Letter

450 4.7.1

SFR_IN_105 Volume Limit Exceeded

Rate Limiting

The sending IP exceeded the volume allowed by its current reputation tier.

SFR ties connection, message, and hourly limits to reputation. Overrunning those thresholds produces SFR_IN_105 and a two-hour suspension.

Severity

WARNING

Provider

SFR

Reference

SFR_IN_105

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.

  • ✓Throttle deliveries so hourly volume stays within SFR’s recommended levels.
  • ✓Warm new IPs gradually and distribute volume across multiple days.
  • ✓Avoid resending to the same SFR users multiple times in a short window.
  • ✓Track SFR-specific metrics in your deliverability dashboards.

Helpful Resources

More SFR SMTP Codes

Keep these related troubleshooting guides handy while addressing 450 4.7.1.

421 4.7.0 – 421 4.7.0 Too Many Errors
WARNING
450 4.7.1 – SFR_IN_101 Spam Complaints
ERROR
450 4.7.1 – SFR_IN_102 Virus or Malware Detected
CRITICAL
450 4.7.1 – SFR_IN_103 Too Many SMTP Errors
WARNING

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