Error recovery and system fault tolerance routines are a must for this type of software. Electronic Mail Software Electronic mail actually started with BBS systems. But today the newer Internet Electronic Mail software provides more powerful message delivery capabilities than BBS messaging software. There still are BBS based mail delivery systems which are store and forward systems . If a PC owner is willing to leave a computer unattended and dedicated to communications, BBS email software can be used to send and receive messages, reports, and files without the expense of an Internet connection.
Most systems require only a single level of access code and password.
Other more secure systems require multiple levels of passwords and even encryption security. The intent is to provide secure communications between two computers. Some systems use a cryptography key to encipher transmitted bit patterns and decipher received bit patterns. To work properly, the communications software on both ends of link must use matching enciphering and deciphering techniques. Privacy Encrypted Mail .