Returned mail: see transcript for details

[Mail Delivery Subsystem]

The original message was received at Tue, 30 Mar 2021 00:13:57 +0900
from sc7.cynet.co.jp [202.221.162.67]

   ----- The following addresses had permanent fatal errors -----
<smckrell at csf.ne.jp>
    (reason: 550 5.1.1 <smckrell at csf.ne.jp>: Recipient address rejected: User unknown in relay recipient table)

   ----- Transcript of session follows -----
... while talking to mx0.csf.ne.jp.:
>>> DATA
<<< 550 5.1.1 <smckrell at csf.ne.jp>: Recipient address rejected: User unknown in relay recipient table
550 5.1.1 <smckrell at csf.ne.jp>... User unknown
<<< 554 5.5.1 Error: no valid recipients
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