New to linux, have squid, dansguardian, clam need to send mail from exchange server
 

I have set up ubuntu server V9 with squid, dansguardian and clam. I have fetchmail wroking to bring in mail from our externally hosted website and delivering it to users mailboxes in exchange server. That was easy following guides on the internet. However my brain is failing me now. How do I reverse the process and send mail to the outside world. I need to be able to do this without authentication. At the moment i am using a windows environment with exchangepop3 which uses smarthost to connect to the ISP smtp server. Please help or point to a simple guide. If i cannot solve this soon i will have to revert to microsoft solution for the proxy server.

I have done this but not with exchange but Zimbra. But sending a mail using external mail server should require configuration in your exchange. And not in your squid or dans. I have never used exchange ever but there should be some configuration option to specify a relay host for sure.

thanks but how to relay
 

Yes I know how to smarthost out of exchange server but how to pass this through the proxy is my problem

I do not understand your problem then? Are you saying that your proxy is not working in transparent mode?

will making the proxy work in transparent mode do the trick?

I am very new to this. Setting up fetchmail to get the emails from our external server into exchange server was eaasy. Why so difficult to get stuff out?

It is not difficult. Just need to know what you want to do. Making your proxy transparent should make your job a lot easier though.

i am a fool the proxy was listening on localhopst for port 25 not the network card. Solved now thanks

Good. Mark the thread as Solved if you feel your issue is solved.