Please don't blame me. The computer engineers came up with the e-mail system on their own. These days, however, the party most concerned with Japan's romaji chaos is the International Standards Organization which has put Japan on notice to come up with a single, rational, unified system. This difference in Japanese is crucial. If past precedent is any guide, neither the ISO nor anyone else should hold their breaths.
Anarchy is likely to reign for a long time to come.
This problem has been immortalized in the rendering of Tokyo as Tokio in the name of the Tokio Fire and Marine Insurance Company. Perhaps the biggest reason for romaji chaos is that no one single system satisfies all users. While Hepburn makes it easy for non-natives acquainted with the values English assigns to Latin letters to learn how to approximate the sounds of Japanese, it has been strongly denounced by serious educators for distorting the actual forms and sounds of the language. When Kunrei was adopted in the late 1930's, the then powerful Japanese central government did much to try to further its use. Unfortunately, by forcing non-native speakers of Japanese with no intentions of learning the language to abide by a system intended for those who have some command of Japanese, the government gave the impression of intolerant language management which would have dire consequences later on.