Unidentified subject!

I am a Procmail newbie, and I'm trying to get rid
of junk mail which has the following unique header

Reply-To: ghrlm(_at_)usa(_dot_)net

I can't use the From: field because it is from a
mailer daemon and is not unique.

How do I trap the Reply-To: field and send the
message to /dev/null

Can I use 

:0
* ^Reply-To:.* ghrlm(_at_)usa(_dot_)net(_dot_)*
/dev/null