Puppet users - Feb 2014 - Question: performing actions based on user account being present

I want to create a default module for SMTP.  However, I want to put some 
logic into it.

I have postfix as my default local SMTP server for my Linux servers. 
 However, I also have a Zimbra server.  Basically what I want to do is

If 'id zimbra' is true, then ensure service postfix is stopped.
Else ensure service postfix is running, and have the correct main.cf file.

Is that possible?

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