The original message was received at Wed, 21 Dec 2022 15:19:56 +0100 (CET) from btr0xj [132.180.8.25] ----- The following addresses had permanent fatal errors ----- <max-peter.menzel@uni-bayreuth.de> (reason: 550 5.1.1 <max-peter.menzel@uni-bayreuth.de>... User unknown) ----- Transcript of session follows ----- ... while talking to [127.128.8.11]:

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DATA <<< 550 5.1.1 <max-peter.menzel@uni-bayreuth.de>... User unknown 550 5.1.1 <max-peter.menzel@uni-bayreuth.de>... User unknown <<< 503 5.0.0 Need RCPT (recipient)