The original message was received at Sun, 18 Feb 2024 10:45:52 -0500 from a8-55.smtp-out.amazonses.com [54.240.8.55] ----- The following addresses had permanent fatal errors ----- <elena.kulchina@duke.edu> (reason: 550 5.1.1 <elena.kulchina@duke.edu>: Recipient address rejected: User unknown in virtual alias table) ----- Transcript of session follows ----- ... while talking to [152.3.70.26]:

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