By default, Outpost sends emails from our domain (admin@outpost.pub), but they have your name and reply address. The deliverability rates for these emails is typically 99.9%, but if you want the emails to be sent from your own domain, we can do that.
For Luna+ customers, we can send from a subdomain of yours, such as notifications.yoursitename.com. This does require adding some records to your DNS. If you want to do this, we will you get set up, just drop us a line at support@outpost.pub.