"Creating a Reinjection Port
The process that you see below shows how mail arrives at the server and is then sent to a content_filter on port 10024, on to the qmgr and then to amavisd-new which then executes the scanning with both Spamassassin and clamav. When the scanning is complete you do not want to send the scanned mail back to port 10024 because you will create a loop. So you need to create a reinjection port so that the mail that has been scanned will be recognized as complete. The reinjection port that is used is port 10025. This section will now show you how to set up those two ports and activate Spamassassin and clamav."
