PHP Send a mail as UTF-8

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To send a mail from PHP encoded as UTF-8 is fairly easy to do by modifying the headers.

//Sender with special chars (UTF-8) encoded
mail('mail@example.com', '=?UTF-8?B?'.base64_encode($subjectString).'?=', $messageString, "MIME-Version: 1.0\r\nContent-type: text/plain; charset=UTF-8\r\n");
//Sender not UTF-8 encoded
mail('mail@example.com', 'sender@mail.com', $messageString, "MIME-Version: 1.0\r\nContent-type: text/plain; charset=UTF-8\r\n");