connection refused to exchange server

[mj40]

hello, i need help.. im trying to send email from postfix to exchange server (same network) but connection refused, but when i send email from exchange to postfix it successfully received. I tried to simulate this problem into my lab room (same set up of my production environment) i can send/received email from postfix to exchange (vice versa) and no problem occurs. Is there any problem with my postfix configuration? or in my windows environment? Please help :(

[topdog]

Connection refused is usually a simple networking problem.

Just use telnet to verify that you can connect to the exchange server on port 25 from the postfix box.

telnet exchange_ip 25