We have become very used to thinking of "our mailbox" wherever it is....as being "our e-mail". The same kind that appears at your house, office, post office box that is addressed to you....and you open...you read, you re-cycle as you choose.
The internet has brought us e-mail....we had a seller recently that had dozens of addresses and several phone numbers so leaving voice or e-mail meant leaving in multiple places to be sure he got the message.
Your "right to privacy" or what you may think is your right....may not be at all. If your broker, a company...a response or contact on a network...social or business is thru the business....the sponsor...the owner, the manufacture....the social network....it is also "their e-mail".
Sometimes it is not that anything you wrote or have written to you has an "atomic secret level of privacy....or you have said/written/repeated anything of a secretive nature...it just is not anyone else's business.
Soooo if you don't want your e-mails to be "Everyone else's Business"....use your own e-mail...not the brokers', not the networks, not the buyer or seller's company e-mail to discuss their personal business...use your own account. There are lots of places on the internet that have FREE e-mail of course...gmail, yahoo, hotmail....to name a few. If you want your communication protected..the messages you write to be kept private....think twice before you dash off the note...hit the reply...heads up....keyboards alert...know that the intended receiver of your message may not be the only one who reads it.