Mark emails with `?>` as spam.

data/spamRules.php

@@ -261,6 +261,7 @@ $rules['text'][] = function($spam) {
     }
 
     if (strpos(strtolower($spam), 'cialis') !== false
+        || strpos(strtolower($spam), '?>') !== false
         || strpos(strtolower($spam), '<a href=') !== false
         || strpos(strtolower($spam), 'bitcoin') !== false
         || strpos(strtolower($spam), 'augmentin') !== false