Orange SMTP Error Codes
Master email delivery to Orange.fr and Wanadoo.fr. Understand OFR error codes, bilingual messages, and France's largest ISP requirements.
🇫🇷 About Orange Mail
Originally named Wanadoo when created in 1995 by France Telecom, rebranded to Orange in 2006. With over 40% market share, Orange is France's biggest ISP. Since 2007, only provides orange.fr email addresses, though wanadoo.fr remains active in the unified webmail.
Platform Details
- • Domains: orange.fr, wanadoo.fr
- • MX Record: smtp-in.orange.fr
- • France's largest email provider
- • Unified webmail since 2006
Anti-Spam Technology
- • Cloudmark Antispam Solution
- • Vade (ex-Vade Secure) dynamic filtering
- • Signal Spam FBL partnership
- • Reputation-based rate limiting
⚠️ Important Orange Updates
Mid-August 2025 Spam Threshold
Starting mid-August 2025, spam report rates of 0.6% or above might trigger protection mechanisms. This is a relatively strict threshold compared to other ISPs.
Large Sender Requirements
Senders of more than 1,000 messages per day must add the Feedback-ID header, as described by Gmail. This helps with campaign tracking and deliverability.
Orange SMTP Error Codes (OFR) Explained
Orange uses OFR error codes with syntax OFR_XXX or OFRXXX_XXX. Each code has a precise meaning. All messages are bilingual (French/English).
421 OFR004_104
Too Many ConnectionsTrop de connexions, veuillez verifier votre configuration / Too many connections, slow down
You have exceeded the maximum number of concurrent connections allowed from your IP.
How to Fix:
- ✓Reduce the number of concurrent connections
- ✓Check your connection settings
- ✓Implement connection pooling
- ✓Monitor your connection rate
421 OFR004_105
Service RefusedService refuse. Veuillez essayer plus tard / Service refused, please try later
Temporary service refusal, often due to rate limiting or reputation issues.
How to Fix:
- ✓Implement exponential backoff
- ✓Check your sending reputation
- ✓Reduce sending volume
- ✓Try again after waiting period
421 OFR_999
IP SuspendedSending IP is currently suspended for 2 hours
This block was triggered by a previous issue. Check earlier logs for the root cause.
How to Fix:
- ✓Wait 2 hours before retrying
- ✓Review previous error messages for cause
- ✓Fix the underlying issue that triggered suspension
- ✓Contact Orange Abuse Desk if persistent
421 SPF Check Failed
Authentication FailureEmetteur invalide, Veuillez verifier la configuration SPF/DNS / Invalid Sender. SPF check failed
Your SPF record is missing, misconfigured, or the sending IP is not authorized.
How to Fix:
- ✓Add sending IP to SPF record
- ✓Verify SPF syntax is correct
- ✓Check DNS propagation
- ✓Ensure SPF record is not too long
550 OFR006_102
IP BlockedAdresse IP source bloquee pour incident de spam / Client host blocked for spamming issues
Your IP has been blocked by Cloudmark for spam. The error includes a reset request URL.
How to Fix:
- ✓Visit the Cloudmark reset URL provided
- ✓Review and fix spam issues
- ✓Implement proper list hygiene
- ✓Contact Orange Abuse Desk after remediation
OFR004_408
Rate LimitRate limit exceeded
You have exceeded the allowed message rate for your reputation level.
How to Fix:
- ✓Reduce sending speed
- ✓Implement rate limiting
- ✓Build reputation gradually
- ✓Monitor sending patterns
OFR005_104
Connection ErrorConnection-related error
Issue with the SMTP connection or protocol.
How to Fix:
- ✓Check SMTP configuration
- ✓Verify network connectivity
- ✓Review connection logs
- ✓Ensure proper SMTP commands
OFR_416 / OFR_417
Content IssueMessage content or format issue
Your message violates content policies or has formatting issues.
How to Fix:
- ✓Review message content
- ✓Check for spam triggers
- ✓Ensure proper MIME formatting
- ✓Validate HTML structure
📋 Complete OFR Error Code List
Here's a comprehensive list of known Orange error codes:
Orange Email Best Practices
Authentication
- •SPF, DKIM, and DMARC required
- •Ensure SPF includes all sending IPs
- •Align DKIM with From domain
- •Monitor authentication failures
Connection Limits
- •Concurrent connections based on reputation
- •Messages per connection varies by reputation
- •Connections per hour limited by reputation
- •Build reputation gradually
Special Requirements
- •Feedback-ID header for 1000+ msgs/day
- •0.6% spam threshold (mid-Aug 2025)
- •Bilingual error messages (FR/EN)
- •Signal Spam FBL integration
Anti-Spam
- •Cloudmark Antispam Solution
- •Vade (ex-Vade Secure) filtering
- •Dynamic spam filtering
- •Reputation-based limits
📊 Orange Feedback Loop via Signal Spam
Aggregated FBL (CSV)
Similar to Gmail's format, provides complaint volumes per IP per day in CSV format. Accessible to all Signal Spam members.
Postmastery Console integrates with Signal Spam to track Orange complaint rates.
ARF FBL
Unit reports in ARF format sent to dedicated email. Only includes complaints from users who consented to share data. Requires validation by Orange Abuse Desk.
Limited to approved Signal Spam members with good standing.
Technical Configuration
Orange Connection Requirements
MX: smtp-in.orange.fr
- Concurrent SMTP connections per IP
- Messages per connection
- Connections per IP per hour
SPF: required
DKIM: required
DMARC: required
Feedback-ID: campaign:sender:list:customer
📞 Contacting Orange Abuse Desk
Orange has an efficient abuse desk for deliverability issues. Contact is only through their dedicated form:
Orange Abuse Form (French Only)Required Information:
- • Date of occurrence of the problem
- • Sending IP(s)
- • Sending host name(s)
- • Sending domain
- • SMTP code returned by Orange
Orange Resources
Sender Guidelines
Official Orange sender requirements and best practices
Signal Spam
Join Signal Spam for feedback loop access
Cloudmark Reset
Request IP delisting from Cloudmark blocks
Need Help with Orange Delivery?
Navigating French ISP requirements and bilingual error messages can be challenging. Let us help you optimize delivery to Orange.fr and Wanadoo.fr addresses.