[Web] Re-use DKIM key if available

data/web/inc/functions.dkim.inc.php

@@ -197,7 +197,7 @@ function dkim($_action, $_data = null, $privkey = false) {
         return false;
       }
       try {
-        dkim('delete', (array)$domain);
+        dkim('delete', array('domains' => $domain));
         $redis->hSet('DKIM_PUB_KEYS', $domain, $pem_public_key);
         $redis->hSet('DKIM_SELECTORS', $domain, $dkim_selector);
         $redis->hSet('DKIM_PRIV_KEYS', $dkim_selector . '.' . $domain, $private_key_normalized);