Email provider
Yandex SMTP Error Codes and Bounce Messages
Yandex is a Russian search and mail provider with strict published rules on opt-in and unsubscribe handling. Its public postmaster tools were retired after abuse, so troubleshooting means contacting its abuse team directly.
- Codes on record
- 7
- Responses
- 8
- Domains
- yandex.com
SMTP 4211 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 421 across every provider
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 4511 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 451 across every provider
SMTP 5502 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 5511 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 551 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
Yandex bounce questions
›Why is Yandex bouncing my email?
Yandex is a Russian search and mail provider with strict published rules on opt-in and unsubscribe handling. Its public postmaster tools were retired after abuse, so troubleshooting means contacting its abuse team directly. Match the exact wording of your bounce to one of the 8 responses on this page to find the specific reason and fix.
›How do I improve deliverability to Yandex?
Authenticate with SPF, DKIM and DMARC, keep your sending IP and domain reputation clean, mail only engaged recipients, and honour unsubscribes. Yandex also publishes postmaster guidance, linked on this page.
