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'.
De réir cosúlachta, ní thacaíonn an freastalaí amach (SMTP) %S le focail fhaire chriptithe. Má tá tú go díreach tar éis an chuntais a shocrú, athraigh an 'Modh fíordheimhnithe' faoi 'Socruithe an Chuntais | Freastalaí amach (SMTP)' go 'Gnáthfhocal faire'.