We are running SBS 2003. This is a new install on a new server to replace our old server 1 week ago. Everything has been running OK until we stopped receiving push down emails today via exchage.
Worked out that it was when we had connected a software VPN to one of our customers from the SBS server.
If we connect the VPN and send a test email from a yahoo account, no email is received on any of our PCs. As soon as we disconnect the VPN, emails are being received again no problems.
Have 3 VPNs to 3 customers, and it is exactly the same which ever VPN we connect to. The email instantly stops. The exchange email only starts working again as soon as we disconnect the VPN.