25.12.12 Content-Type:
The nature of the body of the message RFC2045
The Content-Type: header describes the nature of the body of a mail message. In the
absence of such a header, the body is presumed to be composed of ASCII characters that
have their high (most significant) bits turned off. One possible setting for this header might
look like this:
Content-Type: text/plain; charset=ISO-8859-1
This header says that the body is plain text (i.e., contains no markup language) and is
represented in the ISO-8859-1 character set.
This header is usually created by the originating MUA. It should never be declared in the
configuration file of pre-V8.7 versions of sendmail. Beginning withV8.7, the charset for
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
25.12 Alphabetized Header Reference | 1155
8- to 7-bit MIME conversions can be declared withth e DefaultCharSet option (?§24.9.31
on page 1000).
When bouncing mail, V8 sendmail creates a MIME-compliant message and includes a
Content-Type: header such as this:
Content-Type: multipart/mixed; boundary="boundary"
If sendmail was compiled to include DSN support (?§3.4.6 on page 111), the Content-Type:
header will look like this:
Content-Type: multipart/report; report-type=delivery-status;
boundary="boundary"
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