The IMAP server %S 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 IMAP-serwer %S zaklučowane hesła njepodpěruje. Jeli sy runje tute konto załožił, spytajće prošu 'Njewěsće přenjesene hesło' jako 'awtentifikacisku metodu' w 'Kontowe nastajenja | Serwerowe nastajenja' nastajić. Jeli zwjetša funguje a nětko nadobo so njeporadźi, je to zwučene znamjo, zo něchtó pospytuje, waše hesło kradnyć.