I've installed the binary installation on an RHEL4 box and it doesn't seem to want to connect to port 7071 (I get a connection refused)

I'm seeing a number of errors:

Oct 7 15:43:19 calendar zimbramon[23098]: 23098:err: Can't start running app amavisd
Oct 7 15:43:21 calendar zimbramon[23098]: 23098:err: Can't start running app mtaconfig
Oct 7 15:43:24 calendar zimbramon[23098]: 23098:err: Can't start running app mysql

Oct 7 15:44:38 calendar zimbramon[23098]: 23098:err: SMTP RESPONSE: FAILURE from localhost: problem connecting
to "localhost", port 25: Connection refused

Oct 7 16:23:14 calendar postfix/postalias[8697]: fatal: bad numerical configuration: message_size_limit =
Oct 7 16:23:15 calendar postfix[8699]: fatal: bad numerical configuration: message_size_limit =

So it really ain't happy - suggestions where to look debugging it?
Which one of the many servers is the one that is supposed to be lisening on 7071?

Dave