Matrice

Accessed from	Sender's address	Recipient's address	Method
internal network	internal	internal	direct transfer
internal network	internal	external	direct transfer
internal network	external	internal	forbidden
internal network	external	external	forbidden
Internet	internal	internal	sender receives an upload ticket
Internet	internal	external	sender receives an upload ticket
Internet	external	internal	get confirmation from recipient
Internet	external	external	forbidden