The original message was received at Thu, 29 Feb 2024 15:31:11 +0100 (MET) from a8-38.smtp-out.amazonses.com [54.240.8.38] ----- 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 mailgate.exchange.uni-bayreuth.de.:

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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)