DNS problems for cloudflare.com hosted domains:

Table of domain names and links to DNSViz graphs and corresponding concise error text. Contact me via email with any follow-up questions.

_25._tcp.mx01.mx-hosting.chDNSViz graphDNSViz text
_25._tcp.mail.markleenen.euDNSViz graphDNSViz text
_25._tcp.box.nobodyghost.netDNSViz graphDNSViz text

mx01.mx-hosting.ch:
. [.]
  [.]  DNSKEY: 8/48903/256 [.], 8/20326/257 [.]
  [.]    RRSIG: ./8/20326 (2020-05-21 - 2020-06-11) [.]
ch [.] [.]
  [.]  DS: 13/55966/2 [.]
  [.]    RRSIG: ./8/48903 (2020-05-26 - 2020-06-08) [.]
  [.]  DNSKEY: 13/63209/256 [.], 13/50016/256 [.], 13/55966/257 [.]
  [.]    RRSIG: ch/13/55966 (2020-05-14 - 2020-06-29) [.]
mx-hosting.ch [.] [.]
  [.]  DS: 13/2371/2 [.]
  [.]    RRSIG: ch/13/63209 (2020-05-15 - 2020-06-15) [.]
  [.]  DNSKEY: 13/34505/256 [.], 13/2371/257 [.]
  [.]    RRSIG: mx-hosting.ch/13/2371 (2020-04-23 - 2020-06-22) [.]
_25._tcp.mx01.mx-hosting.ch
  [!]  TLSA: INVALID_RCODE:SERVFAIL

mail.markleenen.eu:
. [.]
  [.]  DNSKEY: 8/48903/256 [.], 8/20326/257 [.]
  [.]    RRSIG: ./8/20326 (2020-05-21 - 2020-06-11) [.]
eu [.] [.]
  [.]  DS: 8/59479/2 [.]
  [.]    RRSIG: ./8/48903 (2020-05-26 - 2020-06-08) [.]
  [.]  DNSKEY: 8/9876/256 [.], 8/59479/257 [.], 8/58716/256 [.]
  [.]    RRSIG: eu/8/9876 (2020-05-25 - 2020-06-01) [.]
  [.]    RRSIG: eu/8/59479 (2020-05-25 - 2020-06-01) [.]
markleenen.eu [.] [.]
  [.]  DS: 13/2371/2 [.]
  [.]    RRSIG: eu/8/9876 (2020-05-24 - 2020-05-31) [.]
  [.]  DNSKEY: 13/2371/257 [.], 13/34505/256 [.]
  [.]    RRSIG: markleenen.eu/13/2371 (2020-04-24 - 2020-06-23) [.]
_25._tcp.mail.markleenen.eu
  [!]  TLSA: INVALID_RCODE:SERVFAIL

box.nobodyghost.net:
. [.]
  [.]  DNSKEY: 8/48903/256 [.], 8/20326/257 [.]
  [.]    RRSIG: ./8/20326 (2020-05-21 - 2020-06-11) [.]
net [.] [.]
  [.]  DS: 8/35886/2 [.]
  [.]    RRSIG: ./8/48903 (2020-05-26 - 2020-06-08) [.]
  [.]  DNSKEY: 8/35886/257 [.], 8/36059/256 [.]
  [.]    RRSIG: net/8/35886 (2020-05-24 - 2020-06-08) [.]
nobodyghost.net [.] [.]
  [.]  DS: 13/2371/2 [.]
  [.]    RRSIG: net/8/36059 (2020-05-25 - 2020-06-01) [.]
  [.]  DNSKEY: 13/2371/257 [.], 13/34505/256 [.]
  [.]    RRSIG: nobodyghost.net/13/2371 (2020-04-26 - 2020-06-25) [.]
_25._tcp.box.nobodyghost.net
  [!]  TLSA: INVALID_RCODE:SERVFAIL