Is it possible that you haven’t set up your account in eM Client yet? If that is the case, can you please add it in Menu -> Tools -> Accounts, click on the plus icon to add a new mail?
If you have your account set up and are unable to receive new e-mails, can you please tell us if you’re getting any errors/messages? If it is so, could you please post a screenshot of the messages/errors that the program displays and also the log from the tab Log in the Operations window (Menu->Tools->Operations)? Just select all with Ctrl+A and use Ctrl+V to copy it here. Also please include the number of the version that you use (Menu -> Help ->About).