I've recently upgraded our old SBS200 to version 2003 Premium. We upgraded the hardware at the same time and did a new and full installation onto newly formatted hard drives.
The setup is one nic on the server and it along with all clients are connected to a D-Link DI-524 wireless router on a 184.108.40.206-100 IP range. DHCP is handled by the router and each client has a fixed IP tied to it's MAC address. Our internet is cable modem with a fixed IP address and this along with ISP DNS has been entered into the WAN side of the DI-524 router.
We have a fully qualified domain name registed in NZ and an A record "ourservername.firstfruits.co.nz" pointing to our fixed (ISP) IP address and an MX record pointing to "ourservername.firstfruits.co.nz". Port forwarding for 25, 110 and 80 has been setup in the router.
Users and Computers have been added and mostly it's all running fine with a couple of exceptions...
Client computers nic's are set to automatically get IP and this works fine for internet access but they are unable to load companyweb (Intranet) unless the server IP address is entered manually into thier Preferred DNS server field on the nic.
In the past I have always checked the "Obtain DNS server address automatically" and found this to work for internal and external HTTP requests so am at a loss as to why it requires our servers IP in this case.
The other odd thing is that outgoing email to "some" recipients is getting delayed, I'm seeing it in the servers SMTP queue for up to 24hrs.
Any ideas what might be causing this?