Once installed, you may need to edit main.cf to set appropriate values for myorigin, mydestination, and mynetworks. These settings are described in the main.cf file. When this is complete, make sure you are able to start Postfix by running postfix start and are able to send and receive mail through the system
The following figure (adapted from the Postfix documentation) shows the required setup for filtering email using PureMessage:
To create the pictured message flow: