Date:
The origin date RFC2822
The Date: header
specifies the date and time that the mail message
was originally sent. All mail messages must include
this header line. Consequently, the Date: header must be
declared in the configuration file like this:
H?D?Date: $a
The $a macro ($a on page 802) is mandatory in
the field for this header. The value in $a is the current time
in RFC2822 format. (See Support SMTP AUTH in RFC2822 and
Section 5.2.14 in RFC1123.) Only the $a macro should be used
with the Date:
header because it is the only one that is guaranteed
to contain the current date and time in RFC2822 (and
RFC1123) format.
The ?D? flag is
always included with the Date: declaration in the configuration
file. All the standard delivery agents always
include an F=D
flag (F=D on page 769).
The ?D? allows
custom delivery agents to be designed that do not
need a Date:
header.
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