Everything was working fine on my development PC. So I installed the ASP.NET app on the IIS server, and there it doesn't work.
I've ensured that ports 25 and 465 are open for inbound/outbound traffic on the hardware firewall. Windows software firewall is OFF.
Network admins say they see no outbound traffic on port 465.
Any other basic configuration steps required? Does Rebex require any file permissions?