After I have deleted Spam mail, some of them return to the Spam folder.
Kind regards
Hans
A post was split to a new topic: Messages keep moving back to Spam mailbox
SpamSieve does not reprocess messages that have been deleted, so this is probably more of a mail server or mail client issue.
If you are using Apple Mail, this could be caused by damage to Mail’s database, in which case doing a complete rebuild should help.