In the future, we envision hosting a CRM-style system where each user (you) gets an @ownerrez.com email address and all emails are sent from it. Then, when guests reply, their email goes back into our system and we track both inbound and outbound emails against the guest. There is a lot of stuff to cover here including a much more robust guest/contact system so it won't be coming for awhile.
At the moment, we've programmed all emails that are sent to include a REPLY-TO header with your email address so that when the user clicks "Reply" in their email client, the message is sent to you. That way you can answer them and address their issues.
To summarize, email between you and your guests is handled by you in your own email client and not by us. (For now)