Forum OpenACS Q&A: How to change qmail server to new email server

I checked my Microsoft exachange server..its running perfectly.
My server takeing default as LocalHost.I mentioned in my config.tcl file
like this..

ns_param smtphost XXX.XXX.XXX.XXX #my email server IP address

still now iam not recieving and sending emails & notifications...

In which places i have do settings...

How to make configuration with sendmail.in my config.tcl file