Google san box is scary for webmaster, especially for seo markteing. because it will decrease traffic to the site. How about google sandbox get your domain? here is about google sandbox that quotes from wikipedia:
The Sandbox (a.k.a. Sandboxing or the sandbox effect or the Google penalty) is a name given to an observation about the way Google ranks web pages in its index. It is the subject of much debate—its existence has been written about but not confirmed and several observers state that they have observed the contrary.
According to the sandbox effect, Google temporarily reduces the page rank of new domains, placing them into what is referred to as its "sandbox", in an effort to counter the ways that search engine optimizers attempt to manipulate Google's page ranking by creating lots of inbound links to a new web site from other web sites that they own.
Some SEO experts also claim that the sandbox only applies to highly competitive or broad keyword phrases, and can be counteracted by targeting narrow, or so-called long-tail phrases.
check by this
if your your domain appaear it mean your site is not banned (got sandbox)
