How can I access the admin panel from outside the office?

The control panel is accessed by navigating to your machines domain/IP, on port 4044 – similarly to when accessesing the panel locally.

Example: if the mail server has an external address of: mail.company.com, then you would navigate to: http://mail.company.com:4044.

You can also use IP addresses: ie: http://123.456.789.123:4044 (obviously you would use the real IP address)

The only caveat is that any firewall in place must allow TCP access through port 4044 to the mail server.