Two-Way Email Threading in the Unified Inbox for Direct Bookings

When a guest books directly through my website and I send them an email from OwnerRez (via triggers or manually), their reply arrives in my personal email inbox instead of in OwnerRez. I'd like guest email replies to be captured and displayed inside the OwnerRez Unified Inbox, so the full conversation thread - both outbound and inbound - is visible in one place, and I can reply directly from OwnerRez without switching to my email client. This would bring direct-booking email conversations in line with the two-way messaging already available for Airbnb, Vrbo, and other channels.