Fast Track approval process is a quicker way to get your sender domain approved. It takes only a span of 4-6 hours to get your sender domain approved.
All you’ve to do is answer a series of question and submit them.
You’ll get the series of a question when you click on Fast Track Approval under the Approval column in Domain Management
Where do I get Fast Track Approval in Pepipost app?
Settings --> Sending Domains --> Click on Fast Track Approval under Status
Note: This option shows up only when you’ve verified your SPF & DKIM records