<?php
$host = 'localhost';
$db = 'dbname';
$user = 'user';
$password = 'password';
$data = $_POST['email'];

try {
  $db = new PDO("mysql:host=$host;dbname=$dbname", $user, $password);
  $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

  $stmt = $db->prepare("INSERT INTO Users(`emailaddresses`) VALUES($data)");
  $stmt->execute(array($_POST['value']));

} catch(PDOException $ex) {
    echo "mysql error ".$ex->getMessage();
}