How to restrict incoming email to a specific list of email addresses in Comcast Webmail

Sign into Comcast Webmail. Click on Preferences as shown.

From the Preferences Window, select Restrict Incoming Email

Select Yes to Enable Email Controls

Select Allow email from addresses listed below

Enter an email address you wish to receive email from.

Click on ADD

Repeat the previous two steps until you have entered all of the email addresses you wish to receive email from. Click on  UPDATE.

You will receive email only from the addresses you have specified above.