I just setup Windows 7 with Argosoft Mail Server .NET and SQL 2005 Express Edition.

All is well when the Windows firewall is off, but I have not been able to setup a rule to make it work when it is on - even though I THINK I know what I ma doing (ok clearly not) and have tried various options nad vonfigurations.

Help! Cannot have a win machine just hanging on a public IP with no firewall on...

I suppose it is prudent for me to answer my own question
Here is what worked:

1. Erase any automatically created Windows Firewall rules that refer to the UI or Mail service. Do not try to make them work

2. Create a new rule, us the "PORT" option - then allow ports 25, 110 (or others that you need for mail transfer, POP, etc.)

Thanks for providing the answer. I have yet to move to Windows 7. It will probably be awhile before I do. Your experience will help others. Thanks!