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The original message was received at Thu, 7 Sep 2023 15:57:53 +0900 from localhost [127.0.0.1]

----- The following addresses had permanent fatal errors ----- <****@****>

(reason: 550 relay denied)

----- Transcript of session follows ----- ... while talking to mail.wooilcnt.com.:

>>> RCPT To:<****@****>

<<< 550 relay denied

550 5.1.1 <****@****>... User unknown

>>> DATA

<<< 503 RCPT first

451 4.4.1 reply: read error from mail.wooilcnt.com.

어느부분을 수정해야하는지 모르겠네요..