this one is fresh in my head as I was up most of the night to get my @home mail working. This is a 2 step process:
First thing to change is account settings for outlook/express. Click on tools/accounts/properties for your email account. Under the servers tab input the IP address for your mail server incoming mail & outgoing mail. Don't leave it as mail and mail. This only applies for clients not host computer. if you don't know the address use ping commmand from host computer and ping the name of your mail server "ping mail" for you @home customers. Write this number down along with the suffix, you'll need it again later.
next step you are going to input the IP address from mail server in tcp/ip properties of client computer. The trick for the client computers using ics is to enable dns in tcp/ip properties. type in host name "mail" for @home users.
<24.222.8?.?> and suffix alsv1.occa.home.com for you @home users. Input address and press add under DNS server search order then enter in domain suffix search and press ok. Sorry the writing isn't clearer but I haven't had much sleep. This worked instantly for me on 2 seperate client computers let me know if it works for non @ home users as well. I am planning on trying to make some money at this once I gain enough knowledge, this site as well as many others has really helped
on an unrelated note i keep getting conflicting information in regards to gateway settings. My sytem is up and running with ICS, TCP/IP on second nic on host is IP specified with subnet mask but no gateway, Client is setup also with no gateway entry, obtain IP address automatically,use dhcp and as above mentioned dns enabled. is my system the only one setup this way? I can share files, printers,access email and am very secure according to all the web based security checks. any help appreciated.