When web pages containing emails are sent out they are prefixed by MIME Header. Why?
Primarily email consisted messages having simple text written into English and expressed into ASCII. Currently a days on worldwide internet messages can be sent in languages along with accents as German and French, languages without alphabet as Japanese and Chinese etc. the basic idea of MIME is to add structure to the message body and describe encoding rule for non- ASCII messages.
MIME describes five additional message headers to the RFC 822 format.
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 H e a d e r 
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 M e a n i n g 
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 MIME Version 
Content Description 
Content - ID 
Content transfere n coding 
Content Type 
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 Knows the MIME version 
Readable string telling about message 
Unique Identifier 
How the body is wrapped for   transmission 
Nature of the message 
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