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How to use a php email variable with cron using a database
<?php
if(isset($_POST['email']))
{

 $headers = "From: Memory Jet <your_company@example.com>rn";


$to_visitor = $_POST["email"];
$common_data = $_POST["message"];
mail($to_visitor, "Your Memory", $common_data, $headers);

} ?>

id - some record identifier
message - text of the message
to - recipient
from - sender
date_to_send - date to send message on
sent - boolean flag indicating pending/already sent

SELECT id, message, to, from
FROM yourtable
WHERE (date_to_send < now()) AND (sent = false)