<P> The message header must include at least the following fields: </P> <Ul> <Li> From: The email address, and optionally the name of the author (s). In many email clients not changeable except through changing account settings . </Li> <Li> Date: The local time and date when the message was written . Like the From: field, many email clients fill this in automatically when sending . The recipient's client may then display the time in the format and time zone local to him / her . </Li> </Ul> <Li> From: The email address, and optionally the name of the author (s). In many email clients not changeable except through changing account settings . </Li> <Li> Date: The local time and date when the message was written . Like the From: field, many email clients fill this in automatically when sending . The recipient's client may then display the time in the format and time zone local to him / her . </Li>

When was the first ever email sent and by who