trying to avoid spammers by blocking email domains

[candymanjl]

I don't know if other people are experiencing this, a few on vbulletin.com were, but there's been a ton of spamming on my site in the last month, all kinds of crap that I don't want on there. I noticed most were using certain domains for their email address so I blocked a few domains already.

what I would like to do is have it so that they can only use a .com, .net, or .org email address in order to register. with VB the way it is I could enter every domain out there that I don't want and not enter .com, .net, or .org and that should work, but they suggested you guys might have something already that's easier.

Thanks!