- The domain's registration has expired.
- The registrar has blocked access to the domain.
- The domain hasn't been delegated or has been undelegated from the registrar.
- Delegation settings are invalid.
- DNS records for working with Yandex.Mail are not configured or are configured incorrectly.
To solve problems with sending email, contact the domain administrator who assigned the mailbox to you. If you registered the mailbox on a specific site, contact support for that site. The Yandex.Mail for Domain support service can't help you with this.
Some problems that can occur with sending email are covered below, with suggestions for the domain administrator.
I received a non-delivery message
If an email can't be delivered to the recipient, the mail server might respond with a non-delivery report. Some of the report types and solutions for the corresponding problems are described below.
Callout verification failed
This error occurs when mail service is activated for the domain on the hosting provider's or registrar's server. If email is sent to a recipient who uses mail service from the same company, the email goes to a local server.
To solve this problem, disable mail service on your hosting provider's server. For more information, contact your hosting provider.
RCPT-TO no mailbox
Most likely, the recipient domain requires sender verification.
Sender verification is sometimes used by the recipient server for controlling spam. When the server receives email from a new server, it sends an empty message to the return address in order to verify the sender's existence. Since these types of empty messages are sometimes sent with high frequency, it might be seen as a denial-of-service (DoS) attack. In addition, unexpected errors may occur when sending the test message.
Yandex.Mail uses Sender Policy Framework records for maintaining a list of hosts that are allowed to send email on behalf of Yandex.Mail addresses. This makes it difficult to forge the "from" address. Use “Sender Policy Framework” or “DomainKeys” technology as effective anti-spam methods.
To solve this problem, contact the recipient's mail service administrator with a request to add your domain mailbox addresses to the white list for the sender verification service.
550 failed to meet SPF requirements
The recipient's mail server checks the SPF record on the sender's domain when receiving email. Most likely, the SPF record for your domain is configured incorrectly, or an extra SPF record is configured. Make sure that the SPF record conforms to the instructions for configuring DNS records.
Email is filtered to the recipient's spam folder
To avoid having messages marked as spam, configure the SPF record and the DKIM signature for the domain. To check existing SPF records and DKIM signatures, follow the instructions in Configuring DNS records.
If these records are set up correctly and the settings have taken effect, contact support for the mail service where your messages are being marked as spam.
Domain settings are correct, but email isn't delivered
If you are convinced that all of the domain settings are correct, look for a possible cause in the Troubleshooting section in the Help for Yandex.Mail.