1. Execute "omstat -a" in a root terminal on the mail server to ensure that Scalix is running. For a more comprehensive test, I do the following:
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service scalix status
service scalix-tomcat status
service scalix-postgres status
service sendmail status
service ldapmapper status
service httpd status
OR
service apache2 status (this depends on the OS)
All should show "running" status.
2. Assuming that all Scalix-related services are up and running, ensure that the needed ports are opened. Ports 25, 80, 110, 143 and 443, at the minimum, should be opened for access. Check your firewall settings. (In this case, especially check port 80 for HTTP).
3. One other thing: make sure your "hostname.tld" is registered with DNS properly. Execute "host hostname.tld" (with your hostname, of course) at a command prompt on some other machine. If you don't get the answer you expect, there's your problem.
You need to take the time to sit down and read the Scalix documentation slowly and carefully. It covers most of this in quite some detail. Just plan a weekend and do it.
What it won't do, of course, is cover fundamental server administration. It's assumed that you know how to check services, configure your firewall, enable and disable startup scripts, etc., etc.