Adding Project Members Without Email?

Adding Project Members Without Email?

I would like to specify people or contractor companies without setting them up with email addresses because:
. I don't want them seeing our database (one of us manages the contractor)
. The specific contractor has not been selected yet

As far as I can tell, I am required to enter a valid email address so the "team member" can manage an account. I thought of putting in a garbage email address but I can't even give that "team member" a name.

I would have thought this was a common need.

Is there a solution that I am not seeing?
Thanks, Tom