The Kerberos/GSSAPI ticket was not accepted by the IMAP server %S. Please check that you are logged in to the Kerberos/GSSAPI realm.
Nid yw'r tocyn Kerberos/GSSAPI wedi'i dderbyn gan y gweinydd IMAP %S. Gwiriwch eich bod wedi mewngofnodi i gylch Kerberos/GSSAPI.