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.
Tha coltas nach eil am frithealaiche POP3 a' cur taic ri faclan-faire crioptaichte. Ma tha thu dìreach air an cunntas seo a chruthachadh, feuch is atharraich an "Dòigh dearbhaidh" gu "Facal-faire, 'ga thar-aiseag gu mì-thèarainte" ann an "Roghainnean a' chunntais | Roghainnean an fhrithealaiche". Nam b' àbhaist dha a bhith ag obair mar bu chòir is ma dh'fhàillig e gu h-obann, seo suidheachadh cumanta far am b' urrainn do chuideigin am facal-faire agad a ghoid.