Email provider
Free SMTP Error Codes and Bounce Messages
Free is a French ISP that provides mailboxes to its customers. Its postmaster pages document error codes and IP lookups and explain how to report a wrong spam verdict.
- Codes on record
- 3
- Responses
- 6
Postmaster & documentation
SMTP 5504 responses
A hard failure. The receiving server has refused the message for good and will not accept an unchanged retry without a change on the sending side. See SMTP 550 across every provider
SMTP 5521 response
A hard failure. The receiving server has refused the message for good and will not accept an unchanged retry without a change on the sending side. See SMTP 552 across every provider
SMTP 5541 response
A hard failure. The receiving server has refused the message for good and will not accept an unchanged retry without a change on the sending side. See SMTP 554 across every provider
Free bounce questions
›Why is Free bouncing my email?
Free is a French ISP that provides mailboxes to its customers. Its postmaster pages document error codes and IP lookups and explain how to report a wrong spam verdict. Match the exact wording of your bounce to one of the 6 responses on this page to find the specific reason and fix.
›How do I improve deliverability to Free?
Authenticate with SPF, DKIM and DMARC, keep your sending IP and domain reputation clean, mail only engaged recipients, and honour unsubscribes. Free also publishes postmaster guidance, linked on this page.
