This POP3 server does not seem to support encrypted passwords. If you just set up the account, please try changing to 'Password, transmitted insecurely' as the 'Authentication method' in the 'Account Settings | Server settings'. If it used to work and now suddenly fails, this is a common scenario how someone could steal your password.
Zda so, zo POP3-serwer zaklučowane hesła njepodpěruje. Jeli sy runje tute konto załožił, spytajće prošu 'Hesło, njewěsće přenjesene' jako 'awtentifikacisku metodu' w 'Kontowe nastajenja | Serwerowe nastajenja' nastajić. Jeli zwjetša funguje a nětko nadobo so njeradźi, je to zwučene znamjo, zo něchtó pospytuje, waše hesło kradnyć.