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