The certificate used to sign the message was issued by a certificate authority whose own certificate has been revoked. You should not trust the validity of this message until you verify its contents with the sender.
D'eisigh údarás teastas a bhfuil a theastas féin cúlghairthe an teastas lena shíníodh an teachtaireacht. Ní ceart duit muinín a chur i mbailíocht na teachtaireachta seo go dtí go mbeidh a hinneachar fíoraithe agat leis an seoltóir.