X. 400(An international messaging standard that can be used by a variety of messaging systems. X.400 uses a strict addressing method that reflects a hierarchical environment. The use of X.400 has been largely supplanted by the combination of SMTP and MIME)
X.400 An international messaging standard that can be used by a variety of messaging systems. X.400 uses a strict addressing method that reflects a hierarchical environment. The use of X.400 has been largely supplanted by the combination of SMTP and MIME
