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.
Re POP3 k'uxasamaj re' achi'el man yeruköch' ta ewan kisik'ixik ewan taq tzij. We nak'ïs runuk'ulem re rub'i' taqoya'l re', tatojtob'ej najäl pa 'Ewan tzij, itzel elesan' achi'el 'Rub'eyal jikib'anem' pa 'Runuk'ulem Rub'i' Taqoya'l | Runuk'ulem k'uxasamaj'. We xa ta xsamäj po wakami k'ate nisach, jun relik rub'eyal toq k'o neleq'an ri ewan atzij.