And many people miss the human touch that comes with a well-written letter, with careful penmanship on fine paper. Email, by comparison, comes off as impersonal and boring. There are a lot of other problems, but you get the idea. Email hasn't yet completely replaced snail mail. At least for some people.
All email messages have a common structure.
There is a header that controls information about who should get the message, who is it from, and a lot more. The text of the message goes into the body. These attachments are files that may contain anything that is stored on a computer. Generally there is a size limit to these attachments, so don't expect to send huge things this way. Key Header Information You need to know some of the key features available in the header.