Webmail scripts and multiple servers

What I would like to do is, for reasons of redundancy and system resource usage, have a number of webmail programs running on a machine separate from the actual mail server. So far, I've tried to install Neomail, which doesn't seem to support anything close to this, and Ilohamail, which does (yet another reason to like this little program, lol). My question is:

Does anyone know of other webmail applications that permit being run on a machine remote to the mailserver? It doesn't look like either Horde or Squirrelmail will, but I could be wrong. I want to give people a choice, but...

 

 

 

 

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