Google: Imports a message into only this user's mailbox, with standard email delivery scanning and classification similar to receiving via SMTP This method doesn't perform SPF checks, so it might not work for some spam messages, such as those attempting to perform domain spoofing This method does not send a message Note that the maximum size of the message is 150 MB — request body — body

API reference · Contract 2026-10-27

SDK schema: Imports a message into only this user's mailbox, with standard email delivery scanning and classification similar to receiving via SMTP This method doesn't perform SPF checks, so it might not work for some spam messages, such as those attempting to perform domain spoofing This method does not send a message Note that the maximum size of the message is 150 MB — request body — body

Field	Type	Presence	Description and constraints
$	object	Root	An email message.
classificationLabelValues	array	Optional	Classification Label values on the message. Available Classification Label schemas can be queried using the Google Drive Labels API. Each classification label ID must be unique. If duplicate IDs are provided, only one will be retained, and the selection is arbitrary. Only used for Google Workspace accounts. There’s a limit of 20 Classification Label values per request. If the Classification Label values exceeds the maximum allowed number, the request fails.
classificationLabelValues[]	Model	Each item	Expand Gets the specified message — response body — classification Label Values item
historyId	string	Optional	The ID of the last history record that modified this message. Format: uint64
id	string	Optional	The immutable ID of the message.
internalDate	string	Optional	The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the `Date` header. However, for API-migrated mail, it can be configured by client to be based on the `Date` header. Format: int64
labelIds	array	Optional	List of IDs of labels applied to this message.
labelIds[]	string	Each item
payload	Model	Optional	Expand Sends the specified message to the recipients in the `To`, `Cc`, and `Bcc` headers For more information, see Create and send email messages (https: developers google com workspace gmail api guides sending) — request body — body payload The parsed email structure in the message parts.
raw	string	Optional	The entire email message in an RFC 2822 formatted and base64url encoded string. Returned in `messages.get` and `drafts.get` responses when the `format=RAW` parameter is supplied. @required gmail.users.drafts.create gmail.users.drafts.update Format: byte
sizeEstimate	integer	Optional	Estimated size in bytes of the message. Format: int32
snippet	string	Optional	A short part of the message text.
threadId	string	Optional	The ID of the thread the message belongs to. To add a message or draft to a thread, the following criteria must be met: 1. The requested `threadId` must be specified on the `Message` or `Draft.Message` you supply with your request. 2. The `References` and `In-Reply-To` headers must be set in compliance with the [RFC 2822](https://tools.ietf.org/html/rfc2822) standard. 3. The `Subject` headers must match.

Referenced models: Gets the specified message — response body — classification Label Values item, Sends the specified message to the recipients in the `To`, `Cc`, and `Bcc` headers For more information, see Create and send email messages (https: developers google com workspace gmail api guides sending) — request body — body payload