RE: postfix

I have postfix installed and working locally. However, I can't seem to
use it to send mail from a Windows box on the same network. I have it to
allow my network addresses to connect to it but I get:

Your server has unexpectedly terminated the connection. Possible causes
for this include server problems, network problems, or a long period of
inactivity. Subject 'test4', Account: '192.168.69.108', Server:
'192.168.69.108', Protocol: SMTP, Port: 25, Secure(SSL): No, Error
Number: 0x800CCC0F

I have looked through 4 or 5 howto's on postfix and I must be missing
something here.

Thanks in advance,
Yancey