[dns-operations] Tutanota DNS issues

[Amari CH]

Tutanota has been down for many hours due to DDoS attack.

I have migrated the hosting service with them to other providers.

And their DNS query always returns SEVRFAIL:

$ dig tutanota.com

; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> tutanota.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 9275
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;tutanota.com.                  IN      A

;; Query time: 12 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Sep 17 12:07:00 CST 2020
;; MSG SIZE  rcvd: 41


Do you the community have effective way to stop this type of big traffic 
attack?

Thanks.