How to configure a Linux SD to use an external MTA
The property ext_mta of the smtp service node (keys_path="sphera\services\smtp) should be updated as comma seperated list of all the IP addresses of the external MTAs (in this case only the IP address of the anti-spam server)
The procedure to do this is as follows:
1. Stop SD.
2. Backup /conf/hostdir.xml
4. Search for ext_mta=""
5. Add a list of comma seperated ip addreses of the external mail servers that you are using.
6. Start SD.