Returned mail: User unknown

[via llvm-commits]

The original message was received at 2017-09-29 22:30:34 +0000
                          from postoffice.local [10.0.0.1]

                          ----- The following addresses had permanent
fatal errors ----
                          <soria at moonmobile.net>

                          -----Transcript of session follows -----
                          ... while talking to postoffice.local.:
                          >>> RCPT To:<soria at moonmobile.net>
                          <<< 550 5.1.1 unknown or illegal alias:
soria at moonmobile.net
                          550 <soria at moonmobile.net>... User unknown
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