To Delete Item from whitelist of Spam Filters, perform the following steps:
1 – Open cPanel (yourdomain/cPanel).
2 – Click on (Spam Filters) from Email section.
3 – Click on Show Additional Configurations.
4 – Click on Edit Spam whitelist Settings.
5 – Click on X icon beside item to remove it from whitelist.
6 – Click Update Whitelist (whitelist_from).