Upgraded to Big Sur yesterday. Since immediately afterwards, spam is marked properly but not moved out of the inbox. It appears in the SpamSieve log, properly flagged, just doesn’t move to Spam. I did the option-install Apple Mail Plug-In trick but no change. Rules are active, and I can see the SpamSieve is evaluating correctly.
Any good ideas for next steps on this?
Which version of macOS were you using previously?
It sounds like SpamSieve is working fine but that you’re running into a Mail issue (which some people started seeing with Catalina) where Mail rules don’t move messages. It may help to set the rule to use a Spam mailbox on the mail server rather than under On My Mac. There’s more troubleshooting information here.
I seem to have the “local spam mailbox” problem. I created multiple rules to send to a spam mailbox on each server and that seems to be working correctly. Inconvenient, and increased maintenance, but working. Thanks for your help.