Merge pull request #2 from ZgrK/patch-1

Quick fix for sender e-mail

src/ExchangeMailServer.php

@@ -56,7 +56,7 @@ public static function sendEmail($receiverData, $messageData){
 
     private static function saveMessage($client, $receiverData, $messageData){
         // Build the request,
-        $username = 'survey@nsiteam.com';
+        $username = config('ews-mail-server.username');
         $request = new CreateItemType();
         $request->Items = new NonEmptyArrayOfAllItemsType();