The original message was received at Tue, 24 Oct 2023 12:43:36 +0100 from m0307600.ppops.net [127.0.0.1] ----- The following addresses had permanent fatal errors ----- <sofia.angelidou@manchester.ac.uk> (reason: 550 5.1.1 No such recipient <sofia.angelidou@manchester.ac.uk>) ----- Transcript of session follows ----- ... while talking to mx2.its.manchester.ac.uk.:

...

...

RCPT To:<sofia.angelidou@manchester.ac.uk> <<< 550 5.1.1 No such recipient <sofia.angelidou@manchester.ac.uk> 550 5.1.1 <sofia.angelidou@manchester.ac.uk>... User unknown