Description:
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if I have a newline (\n) at the end of last header, it will show to start of message of mail

Test script:
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<?php
$email = '[email protected]';
$headers = 'From: ' . $email . "\n";
$headers .= 'Cc: ' . $email . "\n";
$headers .= 'X-Mailer: PHP/' . phpversion() . "\n";
$headers .= 'Content-Type: text/plain; charset=utf-8' . "\n";
$headers .= 'Content-Transfer-Encoding: 8bit' . "\n";
mail('[email protected]', 'test', 'Hallo', $headers);
?>

Expected result:
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Hallo

Actual result:
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Hallo