This is an OpenPGP message that was apparently corrupted by MS-Exchange and it can't be repaired because it was opened from a local file. Copy the message into a mail folder to try an automatic repair.
Mae hon yn neges OpenPGP gafodd ei llygru yn ôl pob golwg gan MS-Exchange ac nid oes modd ei hatgyweirio oherwydd iddi gael ei hagor o ffeil leol. Copïwch y neges i mewn i ffolder e-bost i roi cynnig ar ei hatgyweirio'n awtomatig.