update mail config

Author: taylorotwell

config/mail.php

@@ -29,7 +29,7 @@
     | mailers below. You are free to add additional mailers as required.
     |
     | Supported: "smtp", "sendmail", "mailgun", "ses", "ses-v2",
-    |            "postmark", "log", "array", "failover"
+    |            "postmark", "log", "array", "failover", "roundrobin"
     |
     */
 
@@ -86,6 +86,14 @@
                 'log',
             ],
         ],
+
+        'roundrobin' => [
+            'transport' => 'roundrobin',
+            'mailers' => [
+                'ses',
+                'postmark',
+            ],
+        ],
     ],
 
     /*