Open Mailsmith’s Preferences window and click on the Spam Handling pane. Make sure that Use SpamSieve is checked. Uncheck Honor SpamAssassin and BogoFilter headers.
Now it is time to train SpamSieve:
The Do an Initial Training section explains which messages (and how many of them) you should train.
If you ever need to manually ask it to sift through a mix of spam and good messages, choose Recalculate Spam Score from the Message menu.
The above is all you need to know about using SpamSieve with Mailsmith. For more information about using SpamSieve with Mailsmith, please see Chapter 8 of the Mailsmith User Manual.
If you need to troubleshoot SpamSieve and Mailsmith, see the Checking the Mailsmith Setup section.