Yandex Cloud Postbox quotas and limits

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Updated at August 27, 2026

Yandex Cloud Postbox has the following limitations:

Quotas are organizational constraints that can be changed by contacting technical support.
Limits are technical constraints of the Yandex Cloud architecture. You cannot change the limits.

If you need more resources, you can increase your quotas in one of the following ways:

To have your request processed, you must have the quota-manager.requestOperator role or higher, e.g., editor or admin.

You can manage your quotas with Cloud Quota Manager.

Type of limit	Value
Maximum number of recipients per email `postbox.recipients_per_email.count`	200
Maximum size of an email with attachments `postbox.email.size`	10 MB
Maximum number of addresses `postbox.identities.count`	10
Maximum email send rate `postbox.send.rate`	1 email per second
Maximum rate of SendBulkEmail method calls per cloud `postbox.send_bulk.rate`	1 request per second
Maximum number of emails that can be sent within a 24-hour time interval `postbox.emails_sent.count`	200
Maximum number of configurations `postbox.configuration_sets.count`	5

The SendBulkEmail method has the following limits:

Type of limit	Value
Maximum number of `BulkEmailEntries` elements per request	50
Maximum total number of recipients across all `BulkEmailEntries` elements¹	500
Maximum total size of the subject and body in a global template (`TemplateContent.Subject`, `TemplateContent.Text`, and `TemplateContent.Html`)	1 MB
Maximum number of variables per global template	50

¹ When counting recipients, the addresses from ToAddresses, CcAddresses, and BccAddresses are included.