Can I use my own domain for email?

Yes. Every paid plan can send from the mailbox you already use — Gmail, Google Workspace, Outlook, or Microsoft 365, connected with an app password under Settings → Email accounts — so customer email goes out from your own domain. Or take a hosted WrapMail inbox on @wrapmail.net: Starter includes 1 shared box and Shop up to 3, with Fleet up to 5. Either way, every quote, invoice, and reminder is sent from that address and replies land in Wraptor.