How are leads added to the CRM?
The enquiries your portal listings produce are already in the CRM's database. Bringing them onto the board is one action inside the CRM, not an import.
There is nothing to copy out of an email and nothing to connect. The CRM reads the same database the portals write your enquiries into, so an enquiry is already there the moment a buyer sends it.
Putting one on your lead board is a single action inside the CRM. It is worth being exact about this: it is something you do rather than something that happens on a schedule in the background, and running it twice cannot produce a second lead for an enquiry you already have.
Each one arrives as a lead and a contact, attached to the property that produced it, carrying the buyer's details and their message.