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.
Zda se, až wuchadny serwer (SMTP) %S njepódpěra skoděrowane gronidła. Jolic rowno konto konfigurěrujośo, wopytajśo 'awtentifikacisku metodu' w 'Kontowe nastajenja | Wuchadny serwer (SMTP)' do 'Gronidło, njewěsće pśenjasone' změniś. Jolic to zwětšego funkcioněrujo, ale něnto nic, jo móžno, až se wašo gronidło kšadnjo.