안녕하세요.

얼마전 사이트를 넘겨받아서 여기서 호스팅하여 쇼핑몰을 사용중인데요.

메인이 반송이 됩니다.

Warning: could not send message for past 4 hours 제목이구요.


Mail Delivery Subsystem<MAILER-DAEMON at
note.byus.net>  이 보낸사람입니다.

내용은 

 **********************************************
   **      THIS IS A WARNING MESSAGE ONLY      **
   **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
   **********************************************

The original message was received at Wed, 8 Jan 2020 19:05:58 +0900
from localhost [127.0.0.1]

  ----- Transcript of session follows -----
<qufl10220921 at daum.net>... Deferred
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old


Reporting-MTA: dns; note.byus.net
Arrival-Date: Wed, 8 Jan 2020 19:05:58 +0900

Final-Recipient: RFC822; qufl10220921 at daum.net
Action: delayed
Status: 4.2.0
Last-Attempt-Date: Wed, 8 Jan 2020 23:20:19 +0900
Will-Retry-Until: Mon, 13 Jan 2020 19:05:58 +0900

입니다. 

어떻게 처리해야하나요?