General questions about Yandex Cloud Postbox
Is there support for Cyrillic domains?
Yes, Yandex Cloud Postbox supports Cyrillic domains (IDN). To use a Cyrillic domain, specify it in Punycode encoding when creating an address. For example, the domain пример.рф will appear as xn--e1afmkfd.xn--p1ai in Punycode.
Can I use my Yandex 360 organization's primary domain for Yandex Cloud Postbox mailings?
Yes, you can specify your Yandex 360 organization's domain in the address settings and send your emails from it.
Are there any Yandex 360 or Yandex Cloud Postbox quotas and limits when using a Yandex 360 domain?
Yandex Cloud Postbox quotas and limits apply when using any domains. For more information, see Quotas and limits in Yandex Cloud Postbox.
Is it required to create an SPF record?
No, creating an SPF record on your custom domain is not required. Each email sent via Yandex Cloud Postbox is signed with two DKIM signatures: one from postbox.yandexcloud.net, our technical domain (with its SPF record preconfigured), and a second from your custom domain. In most cases, such authentication is sufficient for successful email delivery.
However, if the recipient has strict incoming mail screening policies, you may need to add an SPF record to your custom domain as well. For information about how to do this, see SPF.
Why is email delivery delayed?
One common cause of delays is greylisting (greylisting) on the recipient's mail server. This is an anti-spam technique where the server temporarily rejects the first email delivery attempt assuming that a legitimate mail server will repeat it later.
Yandex Cloud Postbox will automatically retry delivery. Usually, after the delay set by the recipient's server, the email will be accepted and delivered.