de to postbank.de: No valid RRSIGs made by a key corresponding to a DS RR were found covering the DNSKEY RRset, resulting in no secure entry point (SEP) into the zone.
mailrelay3.frankfurt.postbank.de/A: No response was received from the server over UDP (tried 12 times). (185.157.33.32, UDP_-_NOEDNS_)
mailrelay3.frankfurt.postbank.de/AAAA: No response was received from the server over UDP (tried 12 times). (185.157.33.32, UDP_-_NOEDNS_)
postbank.de zone: The following NS name(s) did not resolve to address(es): ns2.postbank.de
postbank.de zone: The server(s) were not responsive to queries over UDP. (185.157.33.19, 185.157.35.19)
postbank.de zone: There was an error resolving the following NS name(s) to address(es): ns3.postbank.de
postbank.de/DNSKEY: No response was received from the server over UDP (tried 12 times). (185.157.33.32, UDP_-_NOEDNS_)
postbank.de/DNSKEY: No response was received from the server over UDP (tried 4 times). (185.157.33.32, UDP_-_EDNS0_512_D_KN)