I have a smart mailbox where I move all mail sent to a yahoo address,
I receive “news” from Yahoo that is moved into referred mailbox.
I have not found a rule that will trash or delete just those messages. Some are messages labeled as Spam messages from the same sender that I cannot trash or delete with a rule.
I set Spamsieve to train as spam and stll nothing happens.
I am running Catalina, SpamSierve 2.9.44. Mail 13.4