Classe para envio de email PHP

<?php
class Email{

public function capturaInformacoes(){
//pego os dados enviados pelo formulario
$nome = $_POST["nome"];
$email = $_POST["email"];
$mensagem = $_POST["mensagem"];
$assunto = $_POST["assunto"];
$email_from = $_POST["email_from"];
//formato o campo da mensagem
$mensagem = wordwrap( $mensagem, 50, "<br>", 1);
}

public function validaEmail($email){
if (!ereg("^([0-9,a-z,A-Z]+)([.,_]([0-9,a-z,A-Z]+))*[@]([0-9,a-z,A-Z]+)([.,_,-]([0-9,a-z,A-Z]+))*[.]([0-9,a-z,A-Z]){2}([0-9,a-z,A-Z])?$", $email)){
echo"<center>Digite um email valido</center>";
echo "<center><a href=\"java script:history.go(-1)\">Voltar</center></a>";
exit;
}
}

public function enviaEmail($email,$assunto,$mens,$headers){
mail($email,$assunto,$mens,$headers);
echo"Email enviado com Sucesso!";
}

$arquivo = isset($_FILES["arquivo"]) ? $_FILES["arquivo"] : FALSE;
if(file_exists($arquivo["tmp_name"]) and !empty($arquivo)){
$fp = fopen($_FILES["arquivo"]["tmp_name"],"rb");
$anexo = fread($fp,filesize($_FILES["arquivo"]["tmp_name"]));
$anexo = base64_encode($anexo);
fclose($fp);
$anexo = chunk_split($anexo);
$boundary = "XYZ-" . date("dmYis") . "-ZYX";
$mens = "--$boundary\n";
$mens .= "Content-Transfer-Encoding: 8bits\n";
$mens .= "Content-Type: text/html; charset=\"ISO-8859-1\"\n\n"; //plain
$mens .= "$mensagem\n";
$mens .= "--$boundary\n";
$mens .= "Content-Type: ".$arquivo["type"]."\n";
$mens .= "Content-Disposition: attachment; filename=\"".$arquivo["name"]."\"\n";
$mens .= "Content-Transfer-Encoding: base64\n\n";
$mens .= "$anexo\n";
$mens .= "--$boundary--\r\n";
$headers = "MIME-Version: 1.0\n";
$headers .= "From: \"$nome\" <$email_from>\r\n";
$headers .= "Content-type: multipart/mixed; boundary=\"$boundary\"\r\n";
$headers .= "$boundary\n";
this->enviaEmail($email,$assunto,$mens,$headers);
}
//se não tiver anexo
else{
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1\r\n";
$headers .= "From: \"$nome\" <$email_from>\r\n";
this->enviaEmail($email,$assunto,$mens,$headers);
}
}
?>