hello, 
at first : thanks for your effort 
but its not quite correct alltogether : 
your query 
Quote:test@test:~$ dig g-housing.de @78.47.219.222
just asks for a A record  
better use 
Quote:test@test:~$ dig g-housing.de @78.47.219.222 ANY
then you'll get answers like : 
Quote:dig g-housing.de @78.47.219.222 ANY
; <<>> DiG 9.3.4 <<>> g-housing.de @78.47.219.222 ANY
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11961
;; flags: qr aa rd; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 4
;; QUESTION SECTION:
;g-housing.de.                  IN      ANY
;; ANSWER SECTION:
g-housing.de.           86400   IN      MX      20 mail.g-housing.de.
g-housing.de.           86400   IN      A       78.47.219.222
g-housing.de.           86400   IN      SOA     ns3.g-housing.de. hostmaster.email.com. 2008072300 10800 3600 604800 86400
g-housing.de.           86400   IN      NS      ns2.g-housing.de.
g-housing.de.           86400   IN      NS      ns1.g-housing.de.
g-housing.de.           86400   IN      NS      ns3.g-housing.de.
;; ADDITIONAL SECTION:
mail.g-housing.de.      86400   IN      A       78.47.219.221
ns3.g-housing.de.       86400   IN      A       78.47.219.222
ns2.g-housing.de.       86400   IN      A       89.163.146.34
ns1.g-housing.de.       86400   IN      A       89.163.145.149
;; Query time: 37 msec
;; SERVER: 78.47.219.222#53(78.47.219.222)
;; WHEN: Wed Jul 23 13:10:35 2008
;; MSG SIZE  rcvd: 257
As far as i see all other dns servers [ns1/ ns2] are answering correctly.
For the sake of it i just added a A record for g-housing.de itself, too.
If you got further problems - don't hesitate to contact me directly. 
g-house.de is my former company i sold a couple of month ago. 
g-housing.de was a domain of that, too - but i'm using this one now for my solely purposes. And yes : there's no mail configured at g-housing.de (i don't want to receive mail there because i've already enough mail accounts 

 )