You may find a bunch of spam emails in your BT Mail inbox every time you open it. It makes your inbox look cluttered and you have to manually delete them every time. Spam filtration feature in BT mail stops these emails. But, sometimes it does not work perfectly. In this case, below are the steps you can follow to resolve the issue and stop spam emails on your account.
Go to your browser and visit the BT official website.
After that, choose My BT on the top menu bar, then click on the Log in option.
Next, you should type your BT ID and password to log in to your BTinternet account.
Choose the emails you wish to mark as spam.
From the top bar options section click on the Spam option.
Now, the selected emails will be recognized as spams and you will start receiving emails from them.
Check your inbox after some time to check if the spam filter is working or not. If the process is still not successful then it would be good to reach out for additional help and guides to resolve the problem.
Source:- BT Mail Spam Filter Not Working