450 4.7.1
SFR_IN_103 Too Many SMTP Errors
The IP generated too many SMTP errors unrelated to other SFR_IN codes.
Mismatched TLS, invalid commands, or timeouts lead to SFR_IN_103. The IP is paused for two hours to protect the infrastructure.
Severity
WARNING
Provider
SFR
Reference
SFR_IN_103
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.
- ✓Confirm your HELO/EHLO string is a valid, resolvable hostname.
- ✓Increase SMTP timeouts so the connection does not drop mid-session.
- ✓Avoid testing scripts that intentionally send malformed commands.
- ✓Limit retry attempts during the two-hour suspension window.
Helpful Resources
More SFR SMTP Codes
Keep these related troubleshooting guides handy while addressing 450 4.7.1.
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