Postfix 2nd Instance for Sender-based Routing: Multiple Gmail and Comcast Accounts
Sender-based routing allows delivery actions on email to be made based on the sending address. This makes it possible for each Gmail and or Comcast account to have separate authentication rules. In summary, your home Postfix system can support Gmail and Comcast accounts for all of your family and friends. This tutorial walks you through an example using Gmail and Comcast, but the setup is similar for any ISP specific emails.