X.400 was specified in the 1980s, with the expectation that it would be the universal standard for email. While this did not happen, X.400 is still used for many applications, particularly where high reliability is required.
A new whitepaper on the Isode website summarizes the key features of X.400 that make it good for applications needing high reliability, with particular focus on capabilities not available with Internet email.
You can read the whitepaper here.
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