Postfix Relay Based on Sender Recepient

What is the best practice when one has to implement this sort of ruleset in postfix:

- Email sent from local domain1.com, domain2.com to ex... | Read the rest of http://ift.tt/2iHbsj1

from Web Hosting Talk - Hosting Security and Technology http://ift.tt/2iHbsj1
via https://ifttt.com/ IFTTT