Здравствуйте/ скажите почему Вы так решили?

# dig www.shop.mammatus.biz

; <<>> DiG *.*.*rc*-RedHat-*.*.*-*.**.rc*.el*_*.* <<>> www.shop.mammatus.biz
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: *****
;; flags: qr rd ra; QUERY: *, ANSWER: *, AUTHORITY: *, ADDITIONAL: *

;; QUESTION SECTION:
;www.shop.mammatus.biz. IN A

;; ANSWER SECTION:
www.shop.mammatus.biz. ***** IN CNAME IP.

;; AUTHORITY SECTION:
. **** IN SOA a.root-servers.net. nstld.verisign-grs.com. ********** **** *** ****** *****

;; Query time: *** msec
;; SERVER: IP#**(IP)
;; WHEN: Sat Aug ** **:**:** ****
;; MSG SIZE rcvd: ***

перенаправление есть

# dig www.shop.mammatus.biz @IP

; <<>> DiG *.*.*rc*-RedHat-*.*.*-*.**.rc*.el*_*.* <<>> www.shop.mammatus.biz @IP
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: ****
;; flags: qr rd ra; QUERY: *, ANSWER: *, AUTHORITY: *, ADDITIONAL: *

;; QUESTION SECTION:
;www.shop.mammatus.biz. IN A

;; ANSWER SECTION:
www.shop.mammatus.biz. ***** IN CNAME IP.

;; AUTHORITY SECTION:
. **** IN SOA a.root-servers.net. nstld.verisign-grs.com. ********** **** *** ****** *****

;; Query time: *** msec
;; SERVER: IP#**(IP)
;; WHEN: Sat Aug ** **:**:** ****
;; MSG SIZE rcvd: ***

вс еименно так. на сервере IP Вашего домена не сущесвует

# dig dig www.shop.mammatus.biz @IP

; <<>> DiG *.*.*rc*-RedHat-*.*.*-*.**.rc*.el*_*.* <<>> dig www.shop.mammatus.biz @IP
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: *****
;; flags: qr rd ra; QUERY: *, ANSWER: *, AUTHORITY: *, ADDITIONAL: *

;; QUESTION SECTION:
;dig. IN A

;; AUTHORITY SECTION:
. **** IN SOA a.root-servers.net. nstld.verisign-grs.com. ********** **** *** ****** *****

;; Query time: ** msec
;; SERVER: IP#**(IP)
;; WHEN: Sat Aug ** **:**:** ****
;; MSG SIZE rcvd: **

;; connection timed out; no servers could be reached

Видите, домена нет

проблема с IP . Вам нужно писать им в техподдержку.

ok