& kmail; expects that your PGP binary is called pgp; in the case of GnuPG, it expects the binary to be called gpg. If this is not the case for you, just make a symlink.
El & kmail; espera que el vostre binari PGP s' anomeni pgp. En el cas de GnuPG, s' espera que aquest s' anomeni gpg. Si aquest no fos el cas, haureu de crear un enllaç simbòlic.