How to move to trash folder automatically?

The documentation says:

SpamSieve normally moves spam messages to the Junk mailbox. When using the Mail extension setup, the Move it to the Trash if the spam score is at least setting can be used to move certain (more spammy) messages to the Trash mailbox instead.

That’s exactly what it does.

The issue here is that if your mail server is configured such that the messages bypass SpamSieve, SpamSieve would not have moved those messages to Junk, either. So this really has nothing to do with the Trash preference. It has to do with SpamSieve not being able to see the messages in the first place.

There are two solutions:

  • You can configure your mail server not to move messages out of the Inbox. Then SpamSieve’s normal filtering will be able to see them.

  • If you can’t or don’t want to do that, you can instead configure SpamSieve to refilter messages that arrive on your Mac already in the Junk mailbox. I have mentioned this solution to you multiple times. The first time, you said you would try it and let me know and then stopped replying. The second time, you said you thought it was working. The third time you didn’t reply.