Sorting incoming mail by domain

[Haines Brown <brownh@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

I started with the idea I could configure mutt to accomplish the goal
I describe below, but I'm not sure I can.

I get mail from a mail server that receives mail sent to
brownh@xxxxxxxxxxxxxxxxx I set up another mail sever to receive mail
for brownh@xxxxxxxxxxxxxxxxxxxxxxxxxxx As a result, mail coming to the
historicalMaterialism.info address has a header that looks like this:

  Envelope-to: brownh@localhost
  Received: from localhost
        ([127.0.0.1] helo=teufel.hartford-hwp.com ident=brownh)
        by teufel.hartford-hwp.com with esmtp (Exim 4.63)
  X-Original-To: brownh@xxxxxxxxxxxxxxxxxxxxxxxxxx
  Delivered-To: brownh@xxxxxxxxxxxxxxxxxxxxxxxxxx
  Received: from mail.historicalmaterialism.info [216.239.128.27]
        by teufel.hartford-hwp.com with POP3 (fetchmail-6.3.6)
        for <brownh@localhost> (single-drop); ... 

I retrieve mail with fetchmail, which I have poll both mail
servers. What I would like to do is to read mail from one server using
emacs-rmail and mail from the other server using mutt, with each blind
to the other's mail. Rmail uses as inbox ~/RMAIL, while mutt should
use ~/Mail/ for storing mail. 

Haines Brown