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.
Hartzailearen sinatze- hobespenen azterketak mezua OpenPGP- rekin sinatu behar dela erabaki du, gutxienez hartzaile batzuentzat. Hala ere, ez duzu baliozko OpenPGP sinatze- ziurtagiririk konfiguratu identitate honentzat.