Download one attachment's bytes

GET

/v1/inboxes/{inbox_id}/messages/{id}/attachments/{attId}

• Production
• Local

Authorizations

• AgentKey
  mailbox:read

Parameters

Path Parameters

inbox_id

required

string

Opaque inbox id (the canonical path key). The inbox’s email address is also accepted here as a within-project alias. Treat the id as opaque.

id

required

string

Opaque message id (msg_...). Encodes its owning inbox.

attId

required

string

Opaque attachment id locating one MIME part of the message.

Responses

200

The attachment bytes (Content-Type + Content-Disposition set).

string format: binary

400

Invalid request.

The canonical error envelope. error is a stable machine code.

object

error

required

Stable error code (e.g. unauthorized, forbidden, not_found, invalid, quota_exceeded, rate_limited).

string

Example

forbidden

message

Human-readable detail (never leaks internals).

string

Example

missing required scope

reason

Machine-readable quota reason. inbox_limit_exceeded means billing account inbox capacity across all organizations and projects sharing that account; enrollment_token_mailbox_budget_exhausted means the enrollment key lifetime creation allowance. Read message for recovery; inbox counts are separate from sending quotas.

string

used

Consumed plus reserved units.

integer format: int64

delta

Requested additional units.

integer format: int64

limit

integer format: int64

remaining

integer format: int64

consumed

integer format: int64

reserved

integer format: int64

next_reset_at

Next UTC usage-period boundary; pending reservations survive this boundary.

string format: date-time

upgrade_required

boolean

401

Missing or invalid credential.

The canonical error envelope. error is a stable machine code.

object

error

required

Stable error code (e.g. unauthorized, forbidden, not_found, invalid, quota_exceeded, rate_limited).

string

Example

forbidden

message

Human-readable detail (never leaks internals).

string

Example

missing required scope

reason

Machine-readable quota reason. inbox_limit_exceeded means billing account inbox capacity across all organizations and projects sharing that account; enrollment_token_mailbox_budget_exhausted means the enrollment key lifetime creation allowance. Read message for recovery; inbox counts are separate from sending quotas.

string

used

Consumed plus reserved units.

integer format: int64

delta

Requested additional units.

integer format: int64

limit

integer format: int64

remaining

integer format: int64

consumed

integer format: int64

reserved

integer format: int64

next_reset_at

Next UTC usage-period boundary; pending reservations survive this boundary.

string format: date-time

upgrade_required

boolean

404

Resource not found.

The canonical error envelope. error is a stable machine code.

object

error

required

Stable error code (e.g. unauthorized, forbidden, not_found, invalid, quota_exceeded, rate_limited).

string

Example

forbidden

message

Human-readable detail (never leaks internals).

string

Example

missing required scope

reason

Machine-readable quota reason. inbox_limit_exceeded means billing account inbox capacity across all organizations and projects sharing that account; enrollment_token_mailbox_budget_exhausted means the enrollment key lifetime creation allowance. Read message for recovery; inbox counts are separate from sending quotas.

string

used

Consumed plus reserved units.

integer format: int64

delta

Requested additional units.

integer format: int64

limit

integer format: int64

remaining

integer format: int64

consumed

integer format: int64

reserved

integer format: int64

next_reset_at

Next UTC usage-period boundary; pending reservations survive this boundary.

string format: date-time

upgrade_required

boolean