You specified encryption for this message, but the application either failed to find the encryption certificate specified in your Mail & Newsgroup Account Settings, or the certificate has expired.
Shonraigh tú gur cheart an teachtaireacht seo a chriptiú, ach níor aimsigh an feidhmchlár an teastas criptiúcháin atá sonraithe i do Shocruithe Cuntais, nó tá an teastas as dáta.