help require in vpop3d

hi friends,

can any one tell me how to configure catchall a/c on vpop3d,
i have configured vpop3d , vpop3d is a virtual pop server,  it is 
working fine, all the pop a/c and alias r also working properly , 
but i don't know how to configure catchall a/c, i have tried lots 
of combination , but i failed.

waiting for reply desperatily
thanks in advance

gurjit