To whitelist an email address to ensure you always receive emails from it, login to your cPanel control panel. Click here for instructions on how to get to cPanel.
Next, click the Spam Filters option under the Email section:
Show Additional Configurations
Then, click the Show Additional Configurations option at the bottom of the page to expand it:
Edit Spam Whitelist Settings
Now, click the Edit Spam Whitelist Settings option:
Click the Add A New “whitelist_from” Item option, and input the desired email address in the field:
Confirm Whitelist Item
Click the Update Whitelist (whitelist_from) button once completed to save changes.