[SPAM]Returned mail: see transcript for details

[Mail Delivery Subsystem]

The original message was received at Mon, 29 Mar 2021 15:59:04 +0900
from cbupsrg001.mailsecurity-nec.jp [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<yasudmu_ko at anshinlife-lp.jp>
    (reason: 550 5.1.1 <yasudmu_ko at anshinlife-lp.jp>... User unknown)

   ----- Transcript of session follows -----
... while talking to mosgw00.biglobe.ne.jp.:
>>> DATA
<<< 550 5.1.1 <yasudmu_ko at anshinlife-lp.jp>... User unknown
550 5.1.1 <yasudmu_ko at anshinlife-lp.jp>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)
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