Cant retrieve or receive e-mail throught gmail

Cant retrieve or receive e-mail throught gmail

hi, 
I defined my zoo account via gmail but it stopped working . 
first the outgoing stopped and now also receiving , it say that verification failed - I use my user name and password - the same as i use to sign in to the zoo website. 
all the settings as in instructions on the zoo mail settings. 
it worked but stopped - please advice urgently