"POP server is not responding" / FIXED

Thought I'd better post this in a new thread, as it will show up if anyone else searches for the same problem in future.

I have a new Virtualmin server, but I can't get email to work in my email client.

I have set up a new email user in Virtualmin 'info@mydomain.org', but when I go to add it in my email client (Apple Mail) and go through the set up it says: 'The POP server "mail.mydomain.org" is not responding.'.

I thought it may have been a firewall issue so turned it off with:

$ service iptables stop

Then tried again, but it says the same.

The mail client is using port 110 and 'use SSL' is ticked. Authentication is set to 'password'.

Any ideas what's going on? I think I have webmail turned off (as I never use it) could that be causing a problem?

Also, I noticed that mail.mydomain.org resolves to my site... but I think that's bad for seo as Google sees it as duplicate content, how can I switch that off? (In cPanel it redirects you to a different url rather than treating it as an alias of the main site).

Thanks in advance for any help.

/////EDIT:

I have tried the following telnet commands with iptables on and off:

> telnet mydomain.org 25

Trying MY.CORRECT.IP...
Connected to mydomain.org.
220 host.mydomain.org ESMTP Postfix
421 4.4.2 host.mydomain.org Error: timeout exceeded
Connection closed by foreign host.

> telnet mydomain.org 110

Trying MY.CORRECT.IP...
telnet: connect to address MY.CORRECT.IP: Connection refused
telnet: Unable to connect to remote host

Get the same with iptables both on and off :/