Can we change the "from email" address for different campaigns as we have multiple domains?
Yes, it is possible to set the "From:" to use your own domain name, simply contact us to tell us what domain you want.
But, to preserve good deliverability, it is important to setup the SPF record in the DNS record of your domain. You just have to add this value in your spf record :
Add an SPF record with GoDaddy https://ca.godaddy.com/help/add-an-spf-record-19218