[CentOS] enabling maildir @ cli

Hi all,

I'm following a how-to for ISPConfig using CentOS5.1 and have run into 
the following instruction:

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Dovecot uses Maildir format (not mbox), so if you install ISPConfig on 
the server, please make sure you enable Maildir under Management -> 
Server -> Settings -> Email. ISPConfig will then do the necessary 
configuration.
----

Since I'm ssh'd in to the box and X isn't installed, what's the CLI to 
accomplish this?

Thanks in advance,
-Ray