If you use email through Plesk on your hosting account and want to adjust how spam is handled, you can configure the spam filter settings directly in your email settings. Please follow the steps below:

Step 1. 

Log in to your Rebel account, then select "Products" in the top-left corner. In the top toolbar, you will see "Hosting”. Please select this. 

Step 2. 

Here you will see your hosting packages. Click the purple button that reads "Control Panel" for the package you want to go to. This will open the Plesk Hosting OS in a new tab.

Step 3. 

In the left hand menu, click "Mail".

Step 4. 

You will see a list of your email addresses here please select the one you would like to make edits to. 

Step 5. 

In the top toolbar, you will see the option of "Spam Filter", click this. 

Step 6. 

Here you will see the options for your spam settings. You can control what happens to emails that are identified as spam. To enable your spam filter, please select the check box at the top left. 

Once this is enabled, the system checks incoming messages and flags suspicious ones. You can choose to mark spam by adding SPAM to the subject line, automatically delete the message, or move it to the Spam folder so you can review it later. Select the one you would like by clicking the dot. 

Step 7. 

By selecting "Show Advanced Settings," You can adjust how strict the spam filter is and control which senders are allowed or blocked. The spam filter sensitivity lets you make the filter more or less aggressive when detecting spam. The higher the number, the more aggressive and the more the filter will mark emails as spam, while the lower the number, the less aggressive the filter will be. 

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Step 8. 

Once you have made the necessary changes, you will be able to click "OK" or "Apply" at the bottom of the page.