Electronic mail or email is a widely used network service. It is a system for sending messages or files to other users' computers. Recently, email is considered as one of the most heavily used distributed application. Cryptographic techniques can strongly protect the confidentiality of an email conversation between the originator and the recipient. But many corporations and governments have banned or restricted the use of encryption. This has only-caused Steganography and other unrestricted information-hiding techniques to flourish on the Internet. This work presents the development of a secure email system (called SecweMail) that provides the email sender with a confidentiality property. This property can be done by using an encryption technique performed by an algorithm called Rijndael. To stop banning the encryption message by the censors, the Frog2pn'nce algorithm is applied as Linguistic Steganography (i.e. information hiding in text) on the encrypted message, such that the ciphertext will be hidden in a fake message. By using Rijndael and Frog2prince algorithms together, the proposed system will be more secure than systems that depend only on cryptography algorithms since the attacker should analyze and break two different security algorithms. The developed system is tested practically on a LAN network, and the results obtained were quite encouraging. The implementation of the used algorithms was done by using Visual Basic 6 programming Language.