[Paper-column] Failed mail

[postmaster at acn2.net]

Your message to mailer1.psc.edu was rejected.
I said:
    RCPT To:<johndoe at psc.edu>
And mailer1.psc.edu [128.182.58.100] responded with
    550 5.1.1 <johndoe at psc.edu>... User unknown

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