[mew-int 2514] His/her public key is expired or not signed by yourself

[maxigas]

hi!

when i try to encrypt an outgoing mail i get this error:

"His/her public key is expired or not signed by yourself"

i tried using gpg and gpg2 as well. from the command line i can
encrypt a message with gpg2 without problem. i can also read incoming
encrypted mail. the Master Password feature of mew also works.

GNU Emacs 22.2.1 (powerpc-unknown-linux-gnu) of 2008-04-27 on
voltaire, modified by Debian

Mew version 5.2.53

i tried following the instructions at
http://www.mew.org/feature/smime.html.en, but i am not sure i need
this, and i don't know how to do this:

"First of all, you should obtain a PKCS 12 file, which includes your
certificate and your secret key, from your company. Let's call this
file "keycert.p12".

please help,

maxigas