Has anyone encountered an SMTP error 451 451 4.7.1 when sending email to Yandex subscribers?

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Stac2014-07-07 16:59:13

Email

Stac, 2014-07-07 16:59:13

When sending emails via mailgun to mailboxes managed by Yandex.Mail, we get an error message:
Will retry in 600 seconds: [email protected] → [email protected] Email Subject' Server response: 451 451 4.7.1 Sorry, the service is currently unavailable. Please come back later.
There are no such problems with other e-mail providers.
Who faced similar and how won?

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Vlad Zhivotnev, 2014-07-07
@Stac

This is greylisting .