# raw header fields does not have ':' in its name (e.g. $href->{'from'})
# processed header fields should have ':' in its name (e.g. $href->{'from:'})
$symbol_table{'x'} = 'anno:';		# can be referenced with %x in Form
$symbol_table{'{from}'} = 'fromaddr:';	# can be referenced with %{from} in Form

# in case JIS version of substr() is required to handle this field.
#$NEEDSAFE_HASH{'fromaddr:'} = 1;

# in case definition of $href->{'from:'} is omitted
# because there is no reference for %f in Form option parameter.
#$REF_SYMBOL{'from:'} = 1;

sub scan_sub {
    local ($href) = shift;

    # annotation mark
    if ($href->{'replied'} ne '') {
	$href->{'anno:'} = 'R';
    } elsif ($href->{'forwarded'} ne '') {
	$href->{'anno:'} = 'F';
    } elsif ($href->{'resent'} ne '') {
	$href->{'anno:'} = 'r';
    } else {
	$href->{'anno:'} = ' ';
    }

    # extract pure address portion of sender header address (From:)
    $href->{'fromaddr:'} = &extract_addr($href->{'from'});
}