020522-1:

Transfer of e-mail is often described as the transfer of envelope and content information. What kind of information is usually said to belong to the envelope, and what kind of information is usually said to belong to the content?

Answer

Envelope is information needed during transport, such as: Actual recipients in this transmission (1). Different transmissions of the same message in different directions can have different recipients on the envelope (1). Sender for this transmission of the message (1). This need not be the same as the author in the content, for example a message forwarded from a mailing list usually has the list maintainer as sender on the envelope (1). Requests for delivery notifications, etc. (1) Information only needed by the recipient is stored in the content. (1)

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