Returned mail: see transcript for details
by Mail Delivery Subsystem
The original message was received at Thu, 15 Sep 2022 23:45:41 +0900
from [114.218.244.74]
----- The following addresses had permanent fatal errors -----
<sales01(a)myfmc.or.kr>
(reason: 550 <sales01(a)myfmc.or.kr> No such user here (connected from myfmc.or.kr))
----- Transcript of session follows -----
... while talking to [192.168.10.30]:
>>> RCPT To:<sales01(a)myfmc.or.kr>
<<< 550 <sales01(a)myfmc.or.kr> No such user here (connected from myfmc.or.kr)
550 5.1.1 <sales01(a)myfmc.or.kr>... User unknown
>>> DATA
<<< 503 Bad sequence of commands