Unable to authenticate to Outgoing server (SMTP) %S. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'.
Methu dilysu gweinydd Anfon (SMTP) %S. Gwiriwch eich cyfrinair a dilysu eich 'Dull dilysu' yn 'Gosodiadau Cyfrif | Gweinydd anfon' (SMTP)'.