Why not use a "throw-away" email, like Yahoo, Google, Hotmail, etc., as your contact email for the Library. You can use that address only for the library, insuring that any emails you receive there will be from members, or the library staff, or the ubiquitous spam. And it's rather simple with those systems to set up the BDSM Library mail client as non-spam.

In fact, I would think twice about using any mail client which doesn't allow you to unblock a particular address (unless, of course, it's a work-related email server.)