mutt RPM installation on RH6.1

[Nguyen-Dai Quy]

Hi,
I'm newbie with mutt. I try to install mutt RPM on my Linux RH6.1 box.
I have a error message :

[root@iris] /mnt/cdrom/RedHat/RPMS# rpm -ivh mutt-1.0pre3i-1.i386.rpm 
error: failed dependencies:
        openpgp is needed by mutt-1.0pre3i-1

Where I can found this dependency ?

Thanks in advance !
-- 
Nguyên-Ðai Quý