Email provider
Infomaniak SMTP Error Codes and Bounce Messages
Infomaniak is a Swiss hosting company that runs mail for domains registered with it. Rejections generally follow standard SPF, DKIM and DMARC checks.
- Codes on record
- 2
- Responses
- 2
Postmaster & documentation
SMTP 4501 response
A temporary problem. The sending server keeps retrying for a while, and delivery often recovers on its own once the underlying issue clears. See SMTP 450 across every provider
SMTP 5501 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 550 across every provider
Infomaniak bounce questions
›Why is Infomaniak bouncing my email?
Infomaniak is a Swiss hosting company that runs mail for domains registered with it. Rejections generally follow standard SPF, DKIM and DMARC checks. Match the exact wording of your bounce to one of the 2 responses on this page to find the specific reason and fix.
›How do I improve deliverability to Infomaniak?
Authenticate with SPF, DKIM and DMARC, keep your sending IP and domain reputation clean, mail only engaged recipients, and honour unsubscribes. Infomaniak also publishes postmaster guidance, linked on this page.
