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 <info(a)fs-sprachwissenschaft.uni-kiel.de&gt;: Host or domain name not found. Name service error for name=fs-sprachwissenschaft.uni-kiel.de type=AAAA: Host not found <pfostenloch(a)gmx.net&gt;: host mx00.emig.gmx.net[212.227.15.9] said: 550 Requested action not taken: mailbox unavailable (in reply to RCPT TO command) <fachschaft-ikb-reha-ezw(a)web.de&gt;: host mx-ha03.web.de[212.227.15.17] said: 550 Requested action not taken: mailbox unavailable (in reply to RCPT TO command) <fachschaft-skiw(a)aol.com&gt;: host mx-aol.mail.gm0.yahoodns.net[98.136.96.93] said: 554 delivery error: dd No valid recipients found - atlas104.aol.mail.ne1.yahoo.com (in reply to end of DATA command) <fachschaft_skiw(a)aol.com&gt;: host mx-aol.mail.gm0.yahoodns.net[98.136.96.93] said: 554 delivery error: dd No valid recipients found - atlas104.aol.mail.ne1.yahoo.com (in reply to end of DATA command) <fa-fachschaft(a)uni-koeln.de&gt;: host seraph.rrz.uni-koeln.de[134.95.19.134] said: 550 #5.1.0 Address rejected. (in reply to RCPT TO command) <fachschaft-ufpaeda(a)uni-koeln.de&gt;: host seraph.rrz.uni-koeln.de[134.95.19.134] said: 550 #5.1.0 Address rejected. (in reply to RCPT TO command) <fs-archaeologien(a)uni-koeln.de&gt;: host seraph.rrz.uni-koeln.de[134.95.19.134] said: 550 #5.1.0 Address rejected. (in reply to RCPT TO command) <fs-judaistik(a)uni-koeln.de&gt;: host seraph.rrz.uni-koeln.de[134.95.19.134] said: 550 #5.1.0 Address rejected. (in reply to RCPT TO command) <fs-musikpaedagogik(a)uni-koeln.de&gt;: host seraph.rrz.uni-koeln.de[134.95.19.134] said: 550 #5.1.0 Address rejected. (in reply to RCPT TO command) <fs-musikvermittlung(a)uni-koeln.de&gt;: host seraph.rrz.uni-koeln.de[134.95.19.134] said: 550 #5.1.0 Address rejected. (in reply to RCPT TO command) <fs-rsl(a)uni-koeln.de&gt;: host seraph.rrz.uni-koeln.de[134.95.19.134] said: 550 #5.1.0 Address rejected. (in reply to RCPT TO command) <kme-fachschaft(a)uni-koeln.de&gt;: host seraph.rrz.uni-koeln.de[134.95.19.134] said: 550 #5.1.0 Address rejected. (in reply to RCPT TO command) <rs-rome(a)uni-koeln.de&gt;: host seraph.rrz.uni-koeln.de[134.95.19.134] said: 550 #5.1.0 Address rejected. (in reply to RCPT TO command) <fachschaft(a)islam.uni-kiel.de&gt;: host b2002.mx.srv.dfn.de[194.95.235.20] said: 550 5.1.1 <fachschaft(a)islam.uni-kiel.de&gt;: Recipient address rejected: undeliverable address: host l1ms.rz.uni-kiel.de[2a0a:6200:0:3:72::1] said: 550 inactive (in reply to RCPT TO command) (in reply to RCPT TO command) <fs-geo(a)uni-landau.de&gt;: host nsmtp.uni-landau.de[139.14.105.152] said: 550 5.1.1 <fs-geo(a)uni-landau.de&gt;: Recipient address rejected: undeliverable address: host dove1.uni-landau.de[139.14.105.143] said: 550 5.1.1 <fs-geo(a)uni-landau.de&gt; User doesn't exist: fs-geo(a)uni-landau.de (in reply to RCPT TO command) (in reply to RCPT TO command) <fsgeophysik(a)email.uni-kiel.de&gt;: host c2002.mx.srv.dfn.de[194.95.239.20] said: 550 5.1.1 <fsgeophysik(a)email.uni-kiel.de&gt;: Recipient address rejected: undeliverable address: host l3ms.rz.uni-kiel.de[134.245.11.211] said: 550 Account inactive - no forward-address (in reply to RCPT TO command) (in reply to RCPT TO command)