The original message was received at Mon, 20 Nov 2023 17:08:15 -0500 from a8-51.smtp-out.amazonses.com [54.240.8.51] ----- The following addresses had permanent fatal errors ----- <joshua.bruce@duke.edu> (reason: 550 5.1.1 <joshua.bruce@duke.edu>: Recipient address rejected: User unknown in virtual alias table) ----- Transcript of session follows ----- ... while talking to [152.3.70.26]:

...

...

DATA <<< 550 5.1.1 <joshua.bruce@duke.edu>: Recipient address rejected: User unknown in virtual alias table 550 5.1.1 <joshua.bruce@duke.edu>... User unknown <<< 554 5.5.1 Error: no valid recipients