Sending emails from your own domain
By default, Swift's automated emails are sent from noreply@runswiftapp.com.
However, for emails sent by the Email Blast tool, these can be sent from your own domain. Additionally, if a customer replies to your email blast, the email will be sent to your inbox.
To do this in Admin, go to Marketing > Senders and add your own domain as a "verified sender". You'll need to specify things like physical address, name, etc. to prevent your emails from being flagged as spam.