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$message = "<h1>Hello world!<h1>";
$to      = "empfaenger@system.de";
$subject = "Betrefftext";
$xtra    = "From: ab@sender.de (Ab Sender)
";
$xtra   .= "Content-Type: text/html
Content-Transfer-Encoding: 8bit
";
$xtra   .= "X-Mailer: PHP ". phpversion();

mail($to,
     $subject,
     $message,
     $xtra);