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Multipurpose Internet Mail Extensions MIME HEADER

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'quoted-printable' / 'base64' / '8bit' / 'binary' / x-token. Options: ... Quoted-Printable - Used tor ASC text. Line length is limited to 76 characters. ... – PowerPoint PPT presentation

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Title: Multipurpose Internet Mail Extensions MIME HEADER


1
Multipurpose Internet Mail Extensions (MIME)
HEADER
  • MANOJ TALAGADADEEVI
  • 04/ 03 / 2007

2
INTRODUCTION
  • An Internet Standard that extends the format of
    e-mail to support
  • text in character sets other than US-ASCII
  • non-text attachments
  • multi-part message bodies and
  • header information in non-ASCII character sets.

3
MIME HEADER FIELD
  • A header field is required to define the type of
    data contained in the message body.
  • There are five header fields.
  • MIME Version
  • Content Type
  • Content-Transfer-Encoding
  • Content-ID
  • Content-Description
  • The first three header fields below are required
    and the last two are optional.

4
MIME - Version
  • Describes the version of the MIME message format.
  • Declare the version of the Internet message body
    format standard in use.
  • The presence of this header field is an assertion
    that the message has been composed in compliance
    with this document.
  • This field can be included in the document as
    below
  • MIME-Version 1.0

5
Content Type
  • Describes the MIME content type and subtype.
    There are seven defined types which include
  • Application - Executable or binary code is being
    transmitted which a specific program may be
    required to run.
  • Audio - Audio data.
  • Image - Graphic non-moving images.
  • Message - Encapsulates a message as defined by
    RFC 822.
  • Multipart - Combines several parts of the
    document which have different types.
  • Text - (Default) Specifies text content.
  • Video - Moving images.

6
Content-Transfer-Encoding Header Field
  • Indicate the type of transformation that has been
    used in order to represent the body in an
    acceptable manner for transport.
  • Designed to specify an invertible mapping between
    the "native" representation of a type of data and
    a representation that can be readily exchanged
    using 7 bit mail transport protocols, such as
    those defined by RFC 821 (SMTP).

7
  • The field's value is a single token specifying
    the type of encoding.
  • Formally
  • encoding "Content-Transfer-Encoding" ""
    mechanism
  • mechanism "7bit" case-insensitive
  • / "quoted-printable"
  • / "base64"
  • / "8bit"
  • / "binary"
  • / x-token

8
  • Options
  • 7-Bit - Data is sent as US-ASC data.
  • 8-Bit - 8 bit characters are included in short
    lines.
  • BASE64 - Used for binary files. Three bytes are
    transformed into 4 ASC characters in lines
    limited to a length of 76 characters.
  • Binary - Long lines are sent using 8 bit
    characters. These lines may not be transportable
    using SMTP.
  • Quoted-Printable - Used tor ASC text. Line length
    is limited to 76 characters.
  • X-Token - Defines private encoding values
    prefixed with an "X-".

9
Content-ID Header Field
  • Allows a body of information to refer to another.
  • It is syntactically identical to the "Message-ID"
    header field
  • id "Content-ID" "" msg-id
  • The Content-ID value may be used for uniquely
    identifying MIME entities in several contexts,
    particularly for cacheing data referenced by the
    message / external body mechanism.

10
Content-Description
  • Possible description for a body of information.
  • In the form
  • description "Content-Description" "" text
  • The description is presumed to be given in the
    US-ASCII character set

11
  • QUESTIONS ??
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