Importance

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Abstract

In an electrical mail system, it causes received file to prove whether or not it is identical with transmitted file, thus there is no danger that file with wrong content is used. An electrical mail system in which there is provided a plurality of terminals connected by telecommunication lines, and in which respective terminals transmits and receives electrical mails one another. A terminal of transmission side transmits a file to-be-transmitted, and a necessary data for examining whether or not the file to-be-transmitted is capable of being received accurately as an different electrical mail respectively. A terminal of reception side receives these electrical mails, before examining whether or not the file to-be-transmitted is capable of being received accurately, while collating the file to-be-transmitted obtained from the received electrical mail with the data, thus guaranteeing content of the electrical mail.

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First Claim