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 'Normal password'.
Aqeddac uffiɣ (SMTP) %S ur yettban ara d akken yessefrak awalen uffiren iwgelhanen. Ma yella akken kan i tesbaduḍ amiḍan, ɛreḍ asnifel n 'Tarrayt n usesteb' di 'Iɣewwaṛen n umiḍan | Aqeddac uffiɣ (SMTP)' ɣer 'Awal uffir Amagnu'.