encrypting to expired certificates

[Robert J. Hansen]

>> Yes, OpenPGP is quite permissive about letting people encrypt to
>> expired certificates,
> 
> Did you really mean that? I am not aware of any way how to do that 
> within GnuPG...

Yes.  Hence my choosing of the term "OpenPGP", as opposed to GnuPG.

> signature). This thread started with my question whether that was 
> possible and except for this remark by you nobody has even indicated 
> that it could be done.

Within the OpenPGP spec, there's nothing preventing you.