Problems with Postfix virtual domains

[juris98]

hello - i have broblem - i have 2 domane names test2.no-ip.com and test2.lv
i add in postfix admin first and second domain - it work i can send and get mail form xx@test.lv and ccc@test2.no-ip.com
from no-ip.com domain i can sand and get mails from outsaid bet on test2.lv can't i send mail from gmail to mydomen@test2.lv and it say mydomen@test2.lv>: Host or domain name not found. Name service error for
name=test2.lv type=A: Host not found


but xxx.no-ip.com and test2.lv is real domains and its registred to my server