780455@hostA.com>, <1021169802.330@HostB.co.th>,
<200106020731.BAA20313@HostC.br.ca>
?†‘
whitespace
The In-Reply-To: header should never be declared in the configuration file.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
25.12 Alphabetized Header Reference | 1159
25.12.22 Keywords:
Index to contents RFC2822
The Keywords: header is used to list significant words from the body of the mail message
that aid in the indexing of its contents. This header is never added by sendmail. Although
some MUAs can create this header, it is usually created by Usenet news-posting programs.
The field for the Keywords: header is arbitrary text. This header should never be declared in
the sendmail configuration file.
25.12.23 Mail-From:
Synonym for Received: Obsolete
The Mail-From: header is not defined by any of the RFCs and is rarely seen in message
headers. The sendmail program defines it internally as a synonym for the Received: header.
The Mail-From: header is obsolete.
25.12.24 Message-ID:
Unique identifier for message RFC2822
The Message-ID: header is used to uniquely identify each mail message. This header must
be declared in the configuration file. The field for this header must be an expression in the
syntax of a legal address enclosed in angle brackets (< and >).
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