Hi - I have ISPConfig and our internal MS Exchange server setup on a leased line with two different static I.P' s routed through a SmoothWall firewall. Both mail servers work perfectly and can send and receive e-mail internally and externally. Additionally, the Exchange server can send e-mail to all domains on the ISPConfig server. My problem is that none of the domains on the ISPConfig server can send e-mail to anyone on the exchange server. This problem seems to have started last week when we implemented some changes that were posted on this Forum regarding domains on the ISPConfig server not being able to receive mail at [email protected] - this problem was successfully resolved, but I now have my current problem - any ideas ?