The original message was received at Thu, 1 Dec 2022 11:19:17 GMT from m0214714.ppops.net [127.0.0.1] ----- The following addresses had permanent fatal errors ----- <m.cowling2@brighton.ac.uk> (reason: 550-The email address you have attempted to send to does not exist.) ----- Transcript of session follows ----- ... while talking to mta.brighton.ac.uk.:

...

...

DATA <<< 550-The email address you have attempted to send to does not exist. <<< 550 Contact postmaster@brighton.ac.uk for further assistance. 550 5.1.1 <m.cowling2@brighton.ac.uk>... User unknown <<< 503-All RCPT commands were rejected with this error: <<< 503-The email address you have attempted to send to does not exist. <<< 503-Contact postmaster@brighton.ac.uk for further assistance. <<< 503 Valid RCPT command must precede DATA