This POP3 server does not allow plaintext passwords. Please try changing to 'Encrypted password' as the 'Authentication method' in the 'Account Settings | Server settings'.
Toś ten POP3-serwer njedowólujo njeskoděrowane gronidła. Pšosym wubjeŕśo nastajenje 'Skoděrowane gronidło' ako 'awtentificěrowańsku metodu' w 'Kontowe nastajenja | Serwerowe nastajenja'.