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Janusz S. Bien' wrote:
> I've sent to Sympa a S/MIME signed message to a list using the
> publickey scenario:
>
>      http://steel.klf.uw.edu.pl/wws/arc/hotline-test/2007-08/msg00002.html
>
> It is the first signed message, so it was natural that it required the
> confirmation by mail.
>
> On the basis of 
>
>       http://www.sympa.org/wiki/manual/x509
>
>       User certificates are automatically caught by Sympa when
>       receiving a signed S/MIME messsage,
>
>       Certificates are stored as PEM files in the
>       /home/sympa/expl/X509-user-certs/ directory
>
> I expected to find my certificate in the appropriate directory, which
> in Debian is /var/lib/sympa/x509-user-certs, but the directory is
> empty.
>
> What went wrong?
>   
Sympa should accept S/MIME signed message as authenticated message (ie 
without email chalenge) if the signature is recognized as valid. The 
signature is valid if the message was not modified and if the reciepient 
trust the signer certificate. The recipient trust a certificate if is 
known for that or if is issued by an authority which is trusted. The 
list of trusted certificate authority is a parameter of sympa.conf.

The reason why didn't store the sender certificat in its cache directory 
is probably the same as the reason why it did not recognize the message.

Check https://www.sympa.org/wiki/manual/x509