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