Sparkpost takes care of bounces for you, utilising your domain as the Send From address. You can align with SPF best practises by customising the Return-Path. Here's how to use DNS to update your Return-Path forwarding.

• Login to your Sparkpost account 

• Navigate to the Domains page

• Now you need to edit your DNS records to set up your bounce domain

• Copy the CNAME record mentioned under Bounce and paste it into your DNS

• After the DNS has processed the changes, log back into your Sparkpost account and verify the domains

• After verification, the domain will be ready to be used as a bounce domain