I've got a local Ubuntu server setup for PHP development projects. I'd like to be able to check the mail messages sent to users on that machine. For example, user 'nathan' has mail appended to the file /var/mail/nathan.

I'd like to be able to download or view these email messages from my Windows machine on the same network using say Mozilla Thunderbird.

I've tried setting up an account with the following:

Incoming Server: rg-ubuntu (this is the Ubuntu hostname)
User: nathan@rg-ubuntu
Port: 110

I get a "connection refused" message.

I've tried googling this and can't get a direct answer to this issue.