[Samu]

Code:

$headers .= "Bcc: ";
$query = mysql_query("SELECT email, username FROM WMClanLogusers ORDER BY username ASC");
while($recipients = mysql_fetch_array($query)) {
    $headers .= "".$recipients['email'].", ";
}
$headers .= "From: absender@adresse.tld\r\n";
mail("empfänger@domain.tld", "Betreff", "Nachricht", $headers);