Hello Leo,
Just a suggestion here, but I've been using Mailwasher Pro for many, many years & have never had any problems with spam or nasties on my system.
You may like to give it a try coz they have a free version, but is limited to just the one Account.
Link to the free one >
https://www.mailwasher.net/
Their Pro version is here...
>
https://www.firetrust.com/
As a bonus, they even offer a Lifetime license if you want.
Reasonably priced & their Support Fora is very good if anything turns up or you require assistance.
Hope this helps with your spam annoyance.
(Please note: I have no affiliation to either MWP or Firetrust. I'm just a long term user.)