The Outgoing server (SMTP) %S does not seem to support encrypted passwords. If you just set up the account, try changing the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)' to 'Password, transmitted insecurely'. If it used to work but now doesn't, you may be susceptible to getting your password stolen.
Ri Ruk'uxasamaj elem (SMTP) %S achi'el man yeruköch' ta ewan taq tzij ri ewan kisik'ixik. We k'ab'a' tab'än runuk'ulem ri rub'i' taqoya'l, tatojtob'ej najäl ri 'Rub'eyal jikib'anïk' pa 'Kinuk'ulem Rub'i' Taqoya'l | Ruk'uxasamaj elem (SMTP)' rik'in 'Ewan tzij, ütz rub'anikil talun'. We nisamäj po wakami manäq, rik'in jub'a' retal chi xeleq'äx ri ewan tzij.