Which key is used when more than one are valid?

[David Shaw]

On Sun, Jun 17, 2007 at 02:49:21PM -0400, Jean-David Beyer wrote:
> My gnupg file that I get with edit-keys myuid
> contains, among other things:
> 
> sub  2048g/48FF0850  created: 2007-02-24 expires: 2008-02-24
> sub  4096g/124E0663  created: 2007-06-17 expires: 2009-06-16
> 
> How do I know which key is used when sending e-mail?
> Or is this a Thunderbird question?

GnuPG picks the subkey for you unless explicitly told which one to
use.  In the above case, it would pick the second key, as it is more
recent.

David