A HiveMail registration would cost $180, for instance. Very costy, but it can be 100% managed, and fully integrated with the board. In other words, a very fast webmail for all members with no popups and so on.

http://www.hivemail.com

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram