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.
Tha coltas nach eil am frithealaiche a-mach (SMTP) %S a’ cur taic ri faclan-faire crioptaichte. Ma tha thu dìreach air an cunntas a shuidheachadh, feuch is cleachd “Facal-faire ’ga chur gun tèarainteachd” mar an dòigh dearbhaidh ann an “Roghainnean a’ chunntais | Roghainnean an fhrithealaiche a-mach (SMTP)”. Ma dh’obraich e roimhe, dh’fhaoidte gu bheil beàrn tèarainteachd ann air am b’ urrainn do chuideigin am facal-faire a ghoid ort.