Dynamic sending policies and client-side disaster recovery mechanism for messaging communication

A method involving enqueuing, according to a policy associated with an offering, a document in a queue for delivery to a first document endpoint; transmitting the document to the first document endpoint; retaining a copy of the document and marking the copy to indicate transmission of the document; and upon receipt of an indication, unmarking the copy of the document using the processor; and transmitting the copy to a second document endpoint.