@Anthony Marshall
In this case you as person that wants to contact different person, is putting your email field into contact form with knowledge your mail will be shown to listing owner.
In this case person does not have this knowledge, as offer process can be managed within app. If you look on email, there is no information to reply to this email to get in touch with seller.
You can modify it in email.php of plugin, but will not be done in plugin as it is.