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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.
  • all mail servers (MX) come with an IPv6 address. Mailservers: alt1.gmail-smtp-in.l.google.com., alt2.gmail-smtp-in.l.google.com., alt4.gmail-smtp-in.l.google.com., alt3.gmail-smtp-in.l.google.com., gmail-smtp-in.l.google.com.
  • all mail servers (MX) having an IPv6 address are also reachable through IPv6
  • none of the name servers (NS) comes with an IPv6 address