Providing on-line facsimile transmission services; Electronic transmission of data and documents via computer terminals; Providing e-mail fax services; Electronic message sending; Message sending and receiving services; On-line services, namely, message sending; Electronic transmission of facsimile communications and data featuring encryption and decryption; Wireless facsimile mail services; Facsimile transmission and retrieval services; Providing on-line electronic bulletin boards for transmission of messages among computer users concerning facsimile responses