Entête de mail est foireuses

Warning: mail(): Multiple or malformed newlines found in additional_header

if(mail(LE_MAIL, $titre, stripslashes($corps), $tete)){$ok_mail="true";

<?php if(isset($_POST['Envoyer'])){$erreur="";

// Nettoyage des entrées
while(list($var,$val)=each($_POST)){if(!is_array($val)){$$var=strip_tags($val);}
else{while(list($arvar,$arval)=each($val)){$$var[$arvar]=strip_tags($arval);}}}

// Formatage des entrées
$f_Nom = trim(ucwords(preg_replace("[^a-zA-Z0-9éèàäö\ -]", "", $f_Nom)));
$f_Telephone = trim(preg_replace("[^0-9\ +]", "", $f_Telephone));
$f_Email = trim(preg_replace("[^a-zA-Z0-9éèàäö\ -]", "", $f_Email));
$f_Observation = trim(preg_replace("[^a-zA-Z0-9éèàäö\ -]", "", $f_Observation));

// Verification des champs
if(strlen($f_Nom)<2) {$erreur.="<li>".$ERREUR_CHAMP_1.'<strong>'.$CONTACT_NOM.'</strong>'.$ERREUR_CHAMP_2; $errf_Nom=1;}
if($f_Postule==0) {$erreur.="<li>".$ERREUR_CHAMP_1.'<strong>'.$CONTACT_POSTULE.'</strong>'.$ERREUR_CHAMP_2; $errf_Postule=1;}
if(strlen($f_Email)<2) {$erreur.="<li>".$ERREUR_CHAMP_1.'<strong>'.$CONTACT_EMAIL.'</strong>'.$ERREUR_CHAMP_2; $errf_Email=1; }else{
if(!preg_match('/^[^@]{1,64}@[^@]{1,255}$/', $f_Email)) {$erreur.="<li>".$ERREUR_SYNTX_1.'<strong>'.$CONTACT_EMAIL.'</strong>'.$ERREUR_SYNTX_2; $errf_Email=1;}}
if(strlen($f_Telephone)<2)   {$erreur.="<li>".$ERREUR_CHAMP_1.'<strong>'.$CONTACT_TELEPHONE.'</strong>'.$ERREUR_CHAMP_2; $errf_Telephone=1;}
if($_FILES['f_Curriculum']['error'] == UPLOAD_ERR_NO_FILE) {$erreur.="<li>".$ERREUR_CHAMP_1.'<strong>'.$CONTACT_CV.'</strong>'.$ERREUR_CHAMP_2; $errf_Curriculum=1;}
if($_FILES['f_Motivation']['error'] == UPLOAD_ERR_NO_FILE) {$erreur.="<li>".$ERREUR_CHAMP_1.'<strong>'.$CONTACT_LETTRE.'</strong>'.$ERREUR_CHAMP_2; $errf_Motivation=1;}
if(strlen($f_Observation)<2)  {$erreur.="<li>".$ERREUR_CHAMP_1.'<strong>'.$CONTACT_OBSERVATION.'</strong>'.$ERREUR_CHAMP_2; $errf_Observation=1;}

if($erreur==""){

@mkdir ("_/",0777,true) ;

$upload_file1 = '_/'.$_FILES['f_Curriculum']['name'];
$upload_file2 = '_/'.$_FILES['f_Motivation']['name'];

if (move_uploaded_file($_FILES['f_Curriculum']['tmp_name'], $upload_file1)) {
$ext1 = explode(".", basename($_FILES['f_Curriculum']['name']));
switch($ext1[1]) {default: $attach_type1 = "application/octet-stream"; break;
case "gz": $attach_type1 = "application/x-gzip"; break;
case "tgz": $attach_type1 = "application/x-gzip"; break;
case "zip": $attach_type1 = "application/zip"; break;
case "pdf": $attach_type1 = "application/pdf"; break;
case "png": $attach_type1 = "image/png"; break;
case "gif": $attach_type1 = "image/gif"; break;
case "jpg": case"jpeg": $attach_type1 = "image/jpeg"; break;
case "txt": $attach_type1 = "text/plain"; break;
case "htm": $attach_type1 = "text/html"; break;
case "html": $attach_type1 = "text/html"; break;}

if (move_uploaded_file($_FILES['f_Motivation']['tmp_name'], $upload_file2)) {
$ext2 = explode(".", basename($_FILES['f_Motivation']['name']));
switch($ext2[1]) {default: $attach_type2 = "application/octet-stream"; break;
case "gz": $attach_type2 = "application/x-gzip"; break;
case "tgz": $attach_type2 = "application/x-gzip"; break;
case "zip": $attach_type2 = "application/zip"; break;
case "pdf": $attach_type2 = "application/pdf"; break;
case "png": $attach_type2 = "image/png"; break;
case "gif": $attach_type2 = "image/gif"; break;
case "jpg": case"jpeg": $attach_type2 = "image/jpeg"; break;
case "txt": $attach_type2 = "text/plain"; break;
case "htm": $attach_type2 = "text/html"; break;
case "html": $attach_type2 = "text/html"; break;}


if(file_exists($upload_file1)) {
$file1 = fopen($upload_file1, "r");
$contents1 = fread($file1, filesize($upload_file1));
$encoded_attach1 = chunk_split(base64_encode($contents1));
fclose($file1);}

if(file_exists($upload_file2)) {
$file2 = fopen($upload_file2, "r");
$contents2 = fread($file2, filesize($upload_file2));
$encoded_attach2 = chunk_split(base64_encode($contents2));
fclose($file2);}

$frontiere = '-----=' . md5(uniqid(mt_rand()));

// Titre du message
$titre=$REC_OffreEmploi." : ".$list['f_Postule'][$f_Postule];

// Entête du message
$tete.="From:".$f_Email."\n";
$tete.='MIME-Version: 1.0'."\n";
$tete.='Content-Type: multipart/mixed; boundary="'.$frontiere.'"'."\n";
$tete.= '--'.$frontiere."\n";

// Première pièce jointe
$tete.= "Content-type: ".$attach_type1."; name=".$upload_file1."\n";      
$tete.= "Content-Length:".filesize($upload_file1)."\n";     
$tete.= "Content-transfer-Encoding: BASE64\n";
$tete.= "Content-disposition: attachment; filename=".$upload_file1."\n\n";
$tete.= $encoded_attach1."\n".'--'.$frontiere."\n";

// Seconde pièce jointe
$tete.= "Content-type: ".$attach_type2."; name=".$upload_file2."\n";  
$tete.= "Content-Length:".filesize($upload_file2)."\n";    
$tete.= "Content-transfer-Encoding: BASE64\n";
$tete.= "Content-disposition: attachment; filename=".$upload_file2."\n\n";
$tete.= $encoded_attach2."\n".'--'.$frontiere."\n";

// Corps du message
$corps.=$CONTACT_NOM." : ".$f_Nom."\n";
$corps.=$CONTACT_POSTULE." : ".$list['f_Postule'][$f_Postule]."\n";
$corps.="\n";
$corps.=$CONTACT_TELEPHONE." : ".$f_Telephone."\n";
$corps.=$CONTACT_EMAIL." : ".$f_Email."\n";
$corps.=$CONTACT_OBSERVATION." : ".$f_Observation."\n";

// Envois du mail
if(mail(LE_MAIL, $titre, stripslashes($corps), $tete)) {$ok_mail="true";}

//Sinon
else{$erreur.="<div class='TexteError'>".$ERREUR_ERROR_1."</div>";}
}}
}} ?>