data delivery. Delay Tolerant Networking (DTN) is a new area of research in the field of networking that deals with extending existing protocols or inventing new ones in a coordinated, architecturally clean fashion, to improve network communication when connectivity is periodic, intermittent and/or prone to disruptions and when multiple heterogeneous underlying networks may need to be utilized to effect data transfers. The challenges of this field of research are: 1. Large delays (due to physical
The receiving protocol is used by email client to extract email message from domain’s email server. Figure 5 below shows the e-mail processing diagram using specified protocol. Even the message is not send in a real time platform and it is a delay-tolerant application, it still preferred application because this is the only means of sending a letter in the cheapest way, fast, flexible and reliable. Other the advantages of email is the ability to store the email messages in electronic mailboxes until