Handle Quota on IncomingBox

• The server SHOULD copy the payload to the permanent storage in the user database only after checking that the user current storage plus the payload size does not exceed the allowed quota, if any, plus a given tolerance limit.

  • The Trusted Application SHOULD receive an error message as a response to its storage request, so that it can register the failure to store the date, or inform the sender in the case in which the trusted app is acting as a delegate to deliver a message.