Status 4.7.1#
smtp;451 4.7.1 Sorry, the service is currently unavailable. Please come back later.
The receiver deferred the message and points at a policy or security problem (enhanced status 4.7.1). Use the wording above to pin down the exact fix.
Email provider · 4.x.x transient failure
Yandex SMTP 451 Errors: Every Bounce Response Explained
Every SMTP 451 response on record from Yandex (yandex.com), with the verbatim text, the enhanced status code, a severity rating and a plain-English fix.
The receiver aborted the action because of a local error on its side, such as greylisting, a reputation or content check still running, or a short policy hold. Retries normally succeed once the hold clears.
- Provider
- Yandex
- Code
- 451 (4xx)
- Responses
- 1
- Highest severity
- Unclassified
Yandex SMTP 451 responses
Yandex SMTP 451 questions
›What does an SMTP 451 error from Yandex mean?
The receiver aborted the action because of a local error on its side, such as greylisting, a reputation or content check still running, or a short policy hold. Retries normally succeed once the hold clears. At Yandex, it is a temporary deferral that is retried automatically, and the specific reason is in the enhanced status code and message text of each response below.
›How do I stop Yandex from returning SMTP 451?
Match your bounce text to one of the responses below and follow its guidance. Recipient-side wording means fix the address. Authentication or reputation wording (SPF, DKIM, DMARC, blocklist) means fix your sending setup, and check Yandex's postmaster documentation.