Go to https://pps3.ias.edu and login with your email address and password.
To add an email address on the safe sender list:
1. Click on Safe Senders List on the left pane.
2. Click the add icon found at the top of the page.
3. You will then be prompted for the email address you wish to add.
To add an email address to the block senders list, follow the same steps as above but for step 1, click on Block Senders instead of Safe Senders.