Report on non-delivery to another (non-Yandex) address
If you have sent a message from your Yandex mailbox but it has been rejected by the recipient's mail server, you will get an automatic report from “Mailer-Daemon” with reasons for non-delivery and the name of the server which rejected passing the message to its destination.
The reason for why the email was not received will be indicated in the automatic report. How to find and interpret the error:
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Find the phrase
Diagnostic Code. You will see the error code to the right of it. -
Find this code in the table below.
Tip
For a quicker search, use Ctrl+F for Windows and Cmd+F for macOS.
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Error code |
Reason and solution |
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The email was sent to a non-existing address. Make sure the recipient's address does not include extra punctuation marks, spaces, or quotation marks. Confirm the recipient's email address and resend the message. |
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The recipient's email server considers these messages spam. Try contacting the recipient or their mail service administration by another method and report the problem. If you are sending legitimate messages to your website users or subscribers, please read Yandex requirements for honest mailing lists. Note If you use Yandex 360 for Business, the SPF record must be set up on the linked domain. |
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The recipient's mailbox is full. This usually happens because the recipient rarely uses their mailbox and their mailbox is full. Try contacting the recipient by another method and report the problem. |
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The recipient's address is blocked by their email service. Try contacting the recipient by another method and report the problem. |
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The recipient's email server can't handle large messages. The recipient's email service can't accept your email due to restrictions regarding your attached files. Upload your attachment to a file storage service (such as Yandex Disk) and include a link to it in your message. |
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The Yandex mail server was blacklisted. You can try deleting the Yandex mail server address from the blacklist manually by clicking on the link in the report. You can also contact us by forwarding the full text of the error report using the form below. Also, try contacting the recipient or his/her mail service administration by another method and report the problem. |
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A loop was detected in sent messages. Check forwarding filters and importers for all of your mailboxes. They may be configured incorrectly. If you are sure the problem is not on your end, contact the recipient by an alternative means of communication to report the problem. |
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Forwarding prohibited (the recipient's mail server can't identify Yandex Mail servers because the MX records are set up incorrectly). Try contacting the recipient or their mail service administration by another method and report the problem. Note If you use Yandex 360 for Business and send an email to your domain's mailbox, keep in mind that it may take up to 48 hours for the MX record to propagate. If 48 hours already passed, make sure that the settings match the recommendations given in the article on setting up the MX records. |
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Error verifying the sender. To solve the problem, contact the administration of the recipient's mail service and ask them to enter Yandex Mail email addresses into the whitelist of the sender verification service. Note If you use Yandex 360 for Business, the SPF record must be set up on the linked domain. |