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public:howto:mimeparts [2007/11/30 14:30] (current)
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 +====== About MIME And Its MIME Parts ======
 +
 +E-mail can transfer only text based messages for historical reasons. All protocols for the transfer of e-mail are text based.
 +
 +MIME enhances this model. MIME is way to encode any information in an acceptable format for the transfer layer: to text-based content in the case of e-mail. But it can also do more. You can send multiple text or binary information parts in one message.
 +
 +The basic element of MIME is the Part. Each part knows its type, and all the needed information about its content. There are these major types of Parts:
 +  * Text Part - contains textual information for reading by human. This Part also understands the charset used.
 +  * Binary part - contains any binary data, like executable file, picture, sound etc.
 +  * Message part - contains full nested another mail message.
 +  * Multipart part - is special Part type. It is just a container for one or more nested Parts. 
 +
 +Nested parts can be any Part type including another Multipart. With Multiparts you can create any tree structure of parts.
 +
 +Each e-mail message has one root part. If this root part is a text part, then the message can hold only text. But when you need to encode text and some binary part, your root part must be a multipart which comprises two nested parts (subparts): text and binary.
 +
 +Schema:
 +  1 multipart (mixed type)
 +     1.1 text part
 +     1.2 binary part attachment
 +
 +When you need to send an HTML message with one picture (and the plain text variant of the HTML content), then your root is a Multipart comprising your plain text part and a multipart comprising the HTML text part and the binary image part.
 +
 +Schema:
 +  1 multipart (alternative type)
 +     1.1 text part
 +     1.2 multipart (related type)
 +        1.2.1 text part with HTML content
 +        1.2.2 binary part with picture for HTML part
  
public/howto/mimeparts.txt · Last modified: 2007/11/30 14:30 (external edit)
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