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Not reachable or improvement possible (IPv6)

Unfortunately, this e-mail domain can not be reached by senders using modern IPv6 addresses, or improvement is possible. You should ask your e-mail provider to fully enable IPv6.
  • none of the mail servers (MX) comes with an IPv6 address
  • An insufficient number of name servers (NS) come with an IPv6 address.
  • Nameservers with an IPv6 address: ns01.posteo-dns.de., ns31.posteo-dns.eu.
  • Nameservers with an IPv4 address: ns01.posteo-dns.de., ns31.posteo-dns.eu., ns21.posteo-dns.ch.
  • all name servers (NS) having an IPv6 address are also reachable through IPv6