SFR 550 5.7.1: spam policy rejection.

SFR rejected the message because the content or domain violates its spam policy.

How to fix 550 5.7.1.

Retrying or final
Final
A 5xx reply. The server will not accept this message. Resending it unchanged fails again.
Who is at fault
Sender
Your authentication, reputation, content, or sending pace.
Severity
ErrorPolicy Violation
Permanent550 5.7.1

550 5.7.1 indicates SFR’s filters still see risky behavior after multiple deferrals. Permanent remediation is required before sending resumes.

Next steps

  1. 1Audit content, links, and headers for spam-like characteristics.
  2. 2Remove recent imports or unverified purchases from French lists.
  3. 3Share remediation actions (complaint reduction, authentication fixes) when contacting SFR support.
  4. 4Resume gently with a small, high-engagement segment once trust improves.
SFR documentationEvery raw SMTP 550 reply

The same code at other providers.

Providers word the same code differently. Their fixes differ too.

550 5.7.1GmailLow domain reputationFinal
550 5.7.1GmailMessage flagged as spamFinal
550 5.7.1 [CS01]Apple Mail (iCloud)Local policy blockFinal
550 5.7.1Apple Mail (iCloud)Spamhaus SBL blockFinal
550 5.7.1 LPN007_517Laposte.netDMARC policy rejectFinal
550 5.7.1 LPN007_518Laposte.netContent policy blockFinal
550 5.7.1OrangeSpam policy rejectionFinal

More SFR codes.

Full SFR playbook

Other SFR fixes

450 4.7.1 SFR_IN_101Spam complaintsRetrying
421 4.7.0Too many errorsRetrying
450 4.7.1 SFR_IN_102Virus or malware detectedRetrying
450 4.7.1 SFR_IN_103Too many SMTP errorsRetrying
450 4.7.1 SFR_IN_104Unknown usersRetrying
450 4.7.1 SFR_IN_105Volume limit exceededRetrying

In the glossary

Bounce (Hard)Hard bounce is when an email cannot be delivered because the address is invalid or blocked. It is a permanent failure and the address should be removed from your list.
Suppression ListA suppression list is the place your email tool keeps addresses that should not receive messages. It is a permanent "do not send" list that helps you avoid emailing people who have opted out or caused issues in the past.
List HygieneList hygiene is the practice of cleaning your email list by removing bad or inactive addresses. It keeps your list focused on people who still want your emails.
Bounce RateBounce rate is the percentage of emails that could not be delivered to recipients. It shows how many addresses are invalid or blocked compared to the total you tried to send.

What SFR expects from senders →

More references.

SMTP field manual.

Every SMTP reply code, with real bounces from mailbox providers and spam filters and who needs to act.

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