This should be an interesting one - i've looked into this but can't see how to do this.
We have an internet domain name - lets say it's www.mydomain.com
We have a Windows Domain name on our network thats similar (just has an extra bit on it) - it is in the format company.mydomain.com
Now the interesting thing is this;
1) We have made a DNS entry (webmail.mydomain.com) which points to the external IP of our server. The bosses PDA picks these emails up fine.
2) However when his PDA is in the office it doesn't pick up the emails - it needs to resolve internally to the LAN IP of our server. Common sense would dictate I need to add a DNS entry into our server for webmail.ourdomain.com as being the 192.168.x.x Ip of our server. However I cannot see how to do this - it will only let me add records for *.company.mydomain.com
Any idea how to get round this? I suppose if I can find out it would be useful as I could then do more fancy things like put www.hotmail.com
and so on into the DNS on our server to block non-experienced people from viewing websites they shouldn't be looking at.