Exchange to Linux SMTP outbound email.
We currently have an Microsoft Exchange 2003 server which sends out all our external SMTP traffic.
We would like to implement Linux a box that will be responsible for appending a disclaimer to all outgoing mail, and process all external SMTP traffic using DNS.
So we will set up a SMTP rule on the Exchange box to forward all mail to Linux machine.
Can anyone provide me with some suggestions as what app to use on the Linux box? Something that is entirely free to use in a enterprise environment.