how do I keep a specific email recipient from entering my email inbox?
You can set up a Filter rule to discard the email.
In Appsuite [connect.xfinity.com/appsuite] click on the gear icon and then on Settings
Under Mail click on Filter Rules
Click on Add new rule
Name your rule
Under each section click on Add condition/Add action
Click on Save
Under Add action you probably want to choose Discard