220 mc2-VMP01-COM01.mc2-gan.mc-2.de Microsoft ESMTP MAIL Service ready at Tue, 5 Oct 2021 10:40:26 +0200
USER mc2-gan\DigitalData 
500 5.3.3 Unrecognized command 'USER'
PASS 35452dd!
500 5.3.3 Unrecognized command 'PASS'
LIST
500 5.3.3 Unrecognized command 'LIST'