Inviting Users by E-mail

Is there a more straightforward way of inviting users in by e-mail? I have to invite about 50 leaders into a special restricted group. I know that most have not accessed the community before and do not have an account, which means copying their e-mail address in one by one, selecting it from the little white box that appears, and repeating. Is there truly no way to copy in a list and just invite a bunch of users?