internett şunları buldum

All .DE domains must have:
* at least two name servers, which must be authoritative
* its two name servers on different class C networks (e.g. the first three octets cannot be the same, 216.1.69.1 and 68.42.99.120 would be valid.)
* a SOA (Start of Authority) Refresh value between 10000 and 86400 seconds
* a Retry value between 1800 and 28800 seconds
* a Time to Live (TTL) value between 180 and 345600
* an MX record that resolves to a valid mail server for the life of the domain registration, not just for the registration itself
* The serial numbers for all name server zones for the domain must also match.

bence en mantıklısı vagabondos un dediği yer, .DE ler konusunda sorunsuzsa, oraya biran önce geçmeyi dene. burda yazılanları çoğu hosting desteklemiyor olabilir.