In order to send a message by EMail, your message must consist solely of alphanumeric characters*. This is because graphic protocols vary from machine to machine, so computer services usually send only text (alphanumeric characters). Therefore, if your message has drawings, figures, or signatures, then you can't send it by EMail.
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Since graphic protocols vary from machine to machine, most computer mail services do not support transmittal of pictures and other graphics.
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Since graphic protocols vary from machine to machine, most computer mail services do not support transmittal of
signatures, which is a graphic instead of text.
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Since graphic protocols vary from machine to machine, most computer mail services do not support transmittal of graphs.
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Alphanumeric characters are the characters that appear on a standard typewriter (e.g. ABCDE123!@#").
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Documents containing only alphanumeric characters are ideal for electronic mail.