Restricting new registers to a single e-mail domain

[teach1st]

One of my vB (3.06) boards is only for employees of my school district. To make sure that new registers are employees of the district, we ask for a district e-mail address and then verify it by hand.

We could save a lot of time if ONLY the district e-mails were accepted by the board for registration. Then we could just turn on automatic e-mail verification and go have a beer or something.

Is there any way vBulletin can restrict approval of new registers to only one e-mail domain? (ie, joe-teacher@<font color="Red"><b>myd...com</b></font>)

Thanks!