^TO ?? ^FROM

Hi. I trying to compare both special variables, ^TO and ^FROM
Can i use something like this:

> From = ^FROM
To = ^TO
:0:
* $From ?? $To
myFolder

Here this idea in not working. Why?

Thanks.

Gerardo.

_______________________________________________
procmail mailing list
procmail(_at_)lists(_dot_)RWTH-Aachen(_dot_)DE
http://MailMan.RWTH-Aachen.DE/mailman/listinfo/procmail