Email campaigns usually require a domain that supports sending and receiving emails. If you have a domain that you wish to use for sending well-crafted templated emails, here's what you need to do.
Adding Sender domain -
Navigate to the Profile of your CallHub account and click on "Email." Here, you need to click on "Add domain" to add a new domain for sending emails.
Next, you need to add the domain name and the custom Return-Path record the Support team provides.
Adding Sender Profile -
To add the Sender Profile, you need to click on the "Sender profile" tab from the "Email" section under "Profile" and click on "Create new profile"
Next, you need to enter the Name, from email, and receiving email to finish the setup.
Here's a detailed guide on DKIM and Return-Path records.