Couple of fixes, adding php-json

www/config.php

@@ -6,3 +6,5 @@ $recipients = [
     %%RECIPIENTS_PR%%
   ]
 ];
+
+$from = '%%SMTP_FROM%%';

www/pr.php

@@ -1,5 +1,5 @@
 <?php
-require_once('config.php');
+include('config.php');
 
 // check for POST request
 if ($_SERVER['REQUEST_METHOD'] != 'POST') {
@@ -50,11 +50,9 @@ $message = $decoded['sender']['login']
            . ".\n" .
            $decoded['pull_request']['html_url'];
 
-log("SUBJECT: " . $subject . "; " . $message);
-
 
 foreach($recipients['pr'] as $recp) {
-  mail($recp, $subject, $message);
+  mail($recp, $subject, $message, $from);
 }
 
 // success, do something