>>> "UBvG" == Uwe Brauer via Gnupg-users <gnupg-users@gnupg.org> writes:

> Hi 

> I am on Ubuntu 16.04 running 


> gpgsm (GnuPG) 2.1.11
> libgcrypt 1.6.5
> libksba 1.3.3-unknown

> I am also a die hard user of emacs and use it for encrypting and
> decrypting my mails.

> I received a smime message from a colleague (with his public key
> embedded of course).

> When I tried to send him a smime encrypted and signed message I obtained
> the lisp error:

> Debugger entered--Lisp error: (epg-error "Encrypt failed" "Unusable public 
> key: 53A51054BB68F7C3")


It turned out that I indeed needed root certificate 
AC_Sector_Publico.cer

That I imported via 

  gpgsm --import *.cer

Then everything was fine. Sorry for the noise.

Regards

Uwe Brauer 

Attachment: smime.p7s
Description: S/MIME cryptographic signature

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