[StAPF] Undelivered Mail Returned to Sender

This is the mail system at host mail.zapf.in. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <clemens.schlage(a)asta-hamburg.de&gt;: Host or domain name not found. Name service error for name=asta-hamburg.de type=AAAA: Host not found <asta_hfm(a)hfm-berlin.de&gt;: host mx1.in-berlin.de[192.109.42.28] said: 554 5.7.1 no such user (in reply to RCPT TO command) <asta.info(a)kiho-wuppertal.de&gt;: host mx00.ionos.de[212.227.15.41] said: 550 Requested action not taken: mailbox unavailable (in reply to RCPT TO command) <asta(a)ostfalia.de&gt;: host mx2.sonia.de[141.41.1.238] said: 550 5.1.1 <asta(a)ostfalia.de&gt;: Recipient address rejected: User unknown in relay recipient table (in reply to RCPT TO command) <studentensprecher(a)thhf.net&gt;: host mail.stud.thh-friedensau.de[195.37.84.65] said: 550 Relay not permitted (in reply to RCPT TO command) <Studierendenvertretung.LMZ(a)phil.uni-augsburg.de&gt;: host b2541.mx.srv.dfn.de[194.95.235.14] said: 550 5.1.1 <Studierendenvertretung.LMZ(a)phil.uni-augsburg.de&gt;: Recipient address rejected: undeliverable address: host weihrauch.rz.uni-augsburg.de[137.250.2.16] said: 550 unknown recipient (in reply to RCPT TO command) (in reply to RCPT TO command)