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.
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 'Focal faire, seolta go neamhshlán'. Má fheidhmigh sé roimhe seo ach má tá sé briste anois, seans go bhfuil d'fhocal faire i mbaol goidte.