In our typical set-up the email is not going out from your actual email address, it is going through our email servers and an email address of ours. That said, we do two things to customize the emails so they have your name/branding.
The first is setting up your name/brand as the "Friendly From". This is what recipients see when they are looking at their inbox.
The second is using your name as part of the email address. So it would look something like: firstname.lastname@example.org
We also do have a service that allows emails to be sent via your own domain and email server. You'd just need a 1x DNS server set-up, pricing can be found on the pricing page of our website.