Ian
Sorry I was gettig POP and webmail mixed up myself.
I assume that you do have a domain name registered and other external users can connect to your server (web site or VPN) remotely via the Internet !!??
To connect to your webmail open a web browser and type:
https://www.yourdomain.com/webmail (if set for enabled secure https access only in server manager)
The webmail program IMP will open and you will then be asked for a user account login name and a password
Once entered, the email for that user will be displayed.
Can you do this on your local network ie from a workstation connected directly to the sme server ?
Also
If you do this from an external Internet connected location (and it does not work) then what message do you get ?
I have POP and webmail working OK on a remote located sme server
Let me know here.
Regards
Ray Mitchell