Orange 421 OFR_999: IP suspended (2 hours).

Orange suspended the IP for two hours as a result of earlier policy breaches.

How to fix 421 OFR_999.

Retrying or final
Retrying
A 4xx reply. Your server keeps the message queued and tries again.
Who is at fault
Sender
Your authentication, reputation, content, or sending pace.
Severity
CriticalRate Limiting
Temporary421 OFR_999

OFR_999 indicates a previous OFR code was ignored. Sending resumes automatically after the suspension, but repeat offenses extend the duration.

Next steps

  1. 1Stop sending to Orange domains for the duration of the suspension.
  2. 2Resolve the underlying issue (complaints, invalid users, volume spikes) before resuming.
  3. 3When resuming, cap hourly volume and monitor responses closely.
  4. 4Escalate internally if OFR_999 occurs more than once per week.
Orange documentationEvery raw SMTP 421 reply

More Orange codes.

Full Orange playbook

Other Orange fixes

421 OFR004_104Too many connectionsRetrying
421 OFR004_105Service refusedRetrying
421 SPF Check FailedSPF check failedRetrying
421 OFR004_301Suspicious trafficRetrying
550 OFR006_102IP blocked for spamFinal
550 OFR006_103IP blocked, policyFinal

In the glossary

Bounce (Soft)A soft bounce is when an email fails to deliver for a temporary reason, like a full inbox or a short outage at the recipient mail server. The address is still valid, and the email may be delivered if you try again later.
DeferralA deferral is when a receiving email server temporarily refuses a message but suggests trying again later.
ThrottlingThrottling is when inbox providers or your email platform slow or limit how many emails you can send in a set time. It acts like a speed limit so big sends do not overwhelm their systems or hurt your reputation.
GreylistingGreylisting is an anti-spam technique where a receiving server temporarily rejects emails from unknown senders to test if they are legitimate.

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More references.

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