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    $__to =~ s/(\r\n|\n\r|\r|\n)/\r\n/sg;
    $__cc =~ s/(\r\n|\n\r|\r|\n)/\r\n/sg;
...
    $__xpriority =~ s/(\r\n|\n\r|\r|\n)/\r\n/sg;
    $__x_ms_priority =~ s/(\r\n|\n\r|\r|\n)/\r\n/sg;
    $_mail_Message =~ s/(\r\n|\n\r|\r|\n)/\r\n/sg;

s{ \n\r | \r | \n }{\r\n}gx for
    $__to,
...
    $__xpriority,
    $__x_ms_priority,
    $_mail_Message;