How do I know my site is banned?
Three proves:
1. When I do a search with the site url – the site don’t show in the serps.
2. When I do a search with a unique exact phrase taken from the site – the site don’t show in the serps.
3. Every time Yahoo does a major update I see my site for a couple of hours at top positions, only to be thrown to nowhere later.
Why Yahoo telling me my site is not banned?
Two options:
1. Either they are plain stupit and don’t know how their search engine works.
2. They got something to hide. They probably know there is no reason for the site to be banned but they have an error in their algo and they can’t change it.