Making all links in user posts nofollow

[Jumbo]

Users (and spambots) often posts links in my forums. I would like to make all links in forum threads and signature default to nofollow links.

I went through all settings and did not spot this option, could someone tell me where it is? It must be there because almost every forum I have participated in makes links nofollow.

Also, is there a way to block a user from posting any links until they had x amount of posts.

[Jumbo]

Is this not a feature of vBulletin? Maybe I need a Mod to do this?

There are lots of vBulletin owners here, how do you manage the links in your members posts?

[plasticsurgery]

vBSEO adds no-follow tags - good program but it will cost you $100+

[Jumbo]

Yeah, I have vBSEO but the nofollow option does not work for me.