Implement some more environment variables and simplify test mode

redirect.php

@@ -13,6 +13,11 @@ $debugMode = getenv('DEBUG_MODE');
 // Dry Run Mode will suppress sending an e-mail to Redmine.  Only really useful with debug mode on.
 $dryRun = getenv('DRY_RUN');
 
+// Test addresses work normally, but tag the email subject with "[TEST]".
+$test = getenv('TEST');
+
+$deliveryAddress = getenv('DELIVERY_ADDRESS');
+
 if($debugMode) {
   error_reporting(E_ALL);
 }
@@ -41,7 +46,7 @@ while (!feof($fd)) {
   //if this line is the "delivered-to", extract the subaddress, if there is one.
   if(preg_match("/^delivered-to: (.*)/i", $line, $matches)) {
     $deliveredTo = $matches[1];
-    if(preg_match("/support_mt.*\+(\S*)@/i", $deliveredTo, $matches)) {
+    if(preg_match("/$deliveryAddress.*\+(\S*)@/i", $deliveredTo, $matches)) {
       $project = $matches[1];
     }
   }
@@ -52,9 +57,7 @@ while (!feof($fd)) {
   }
 
   //Alter the Subject if this is a test.
-  $subjectAlterTo = substr($deliveredTo, 1, 12);
-  if(substr($deliveredTo, 1, 15) == 'support_mt_test' &&
-    preg_match("/^Subject:(.*)/i", $line)) {
+  if ($test && preg_match("/^Subject:(.*)/i", $line)) {
     $line = $subject = str_replace('Subject: ', 'Subject: [TEST] ', $line);
   }