If there are email senders who want to be blocked from entering your INBOX, then the solution is to use the blacklist feature. Because there are some valid emails (not spam) and their nature is to advertise to your email, but they are not detected as spam by Spam Expert. How to block it?
1. Make sure you can login Spam Expert panel.
2. Then click Incoming - Protection Settings > Sender Blacklist.
3. Then click Add blacklist sender.
4. If you want to blacklist / block at the domain level, then you need to enter :
5. If you want to blacklist / block at the email sender level, you need to enter :
6. Don't forget to click Save to save the configuration.