Examination of recipient's signing preferences yielded that the message should be signed using OpenPGP, at least for some recipients; however, you have not configured valid OpenPGP signing certificates for this identity.
L' examen de les preferències de signatura del destinatari ha mostrat que el missatge s' hauria de signar usant OpenPGP, per a alguns destinataris com a mínim. Malgrat això, no heu configurat certificats de signat OpenPGP vàlids per a aquesta identitat.