After reinstall Windows I can ́t sign in to email account. I send prtsc. I ́m from Czech republic. Thank you 
Hello Luboš,
you have been banned, because you violated our license policy, because commercial/work use has been detected on your FREE license.
If you wish to purchase eM Client, contact our Sales department.
Regards,
Olivia
dove devo inserire la chiave di attivazione?
Menu>Help>License section.