This is an out there question and I will be way impressed if anyone can answer it (scroll down to the bottom for the question).
Environment and Why I am trying to do what I am:
I have a domain that, for the most part, is hosted by Network Solutions. Let’s call it MyDomain.com.
MyDomain.com is shared by my extended family members around the country and they use the http web interface for mail (http://mail.mydomain.com, server located at NetSol). This was not good enough for me because I wanted my Hermes to get push mail and stuff, along with putting my local family members at the house on Exchange (SBS Server 2003) and active directory.
Pretty straightforward, so far, I obviously used the POP3 connector to bridge about 5 of the 50 emails at NetSol down to my exchange server.
Sending SMTP outbound was, of course, a problem, because exchange has no way to relay, by account, each of my five family members emails out to the NetSol server (log on with their individual account info). So I had to configure my local Exchange box to handle relay for local authenticated MyDomain.com accounts. (of course, I also had to switch to a business DSL line because AT&T blocks all non-AT&T port 25 connections from retail accounts). Add clammail to handle the POP3 SSL and was all hunky dory—a hack, but it worked most of the time because my SMTP server IP was recognized on the internet as not being a retail IP and, therefore, less likely to be SPAM.
Now, I have moved and have no choice but to have this same infrastructure sit on a cable modem. No big problem there either, though, as I used no-ip.com to dynamically change the DNS pointers for myhomeserver.MyDomain.com as the cable guys gave me new DHCP leases.
BUT, even though the cable company does not filter port 25 traffic, most servers out there don’t like my SMTP connections because they are more suspected of being spam (as a result of my IP belonging to the cable company’s subnet). So 70% of my email is refused if I use my SBS server as the relay.
**** as a result, I have to have all outbound SMTP traffic from my AD accounts on SBS Server connect INDIVIDUALLY to their respective accounts back on the NetSol server.
How do I accomplish this or is there a better solution:
Is there a way for each AD account on exchange, for example “MyADUsername”, to make all SMTP mail connect to the server mail.mydomain.com using MyNetSolUserName and MyNetSolPasswoard while another AD account, for example “MyWifesADUsername” makes the SMTP mail connect to the server using MyWifesNetSolUsername and MyWifesNetSolPassword?