....84: content type
01: how many parts in the message (in this case only one)
01: multipart header size ( only datatype)
859a: size of the text (for example)
0x03: text/plain ( it is only text)--->or perhaps is 0x03+0x80=0x83?
0x00: i have to put this character like end of string? or it is not necessary???
AFTER THIS, IF I WOULD WANT TO PUT AND IMAGE TOO:
859a: (size of the image (for example)
0x1d: data type (a gig image)
IT IS CORRECT???