Create a presigned mailbox attachment upload
Messages
Create a presigned mailbox attachment upload
Creates a short-lived signed PUT URL for one attachment. The caller must be authenticated to mint the URL; the later PUT uses the signed URL, exact Content-Type, and exact Content-Length without sending an API key. The PUT returns a blob ID that can be supplied to POST /mailbox/messages/send.
POST
Create a presigned mailbox attachment upload
Authorizations
Sendmux API key. Use a root API key for Management API routes, or a mailbox credential for Mailbox API routes. Obtain keys from the dashboard under API Keys.
Query Parameters
Mailbox public ID to target when the credential grants access to more than one mailbox. Omit when the credential is scoped to exactly one mailbox.
Body
application/json