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.
Ri IMAP k'uxasamaj %S man yeruköch' ta ewan kisik'ixik ewan taq tzij. We nuk'isib'ej runuk'ulem re rub'i' taqoya'l re', tatojtob'ej najäl pa 'Ewan tzij, itzel q'alajisan' achi'el 'Rub'eyal jikib'anïk' pa 'Runuk'ulem Rub'i' Taqoya'l | Runuk'ulem k'uxasamaj'. Xa ta xsamäj chuqa' wakami k'a te nisach, jun relik retal achi'el rub'eyal jun winäq nreleq'aj ri ewan atzij.