spam applications

[The Stig]

At the moment I have my forum as a members only area. You have to be approved before access is granted. However, I get between 10 and 30 spam applications a day to join. All weird names, weird email etc etc. Its so annoying. Is there a way I can stop this?

Many thanks for any and all help.

The Stig.

[karlbenson]

Would this mod help?
http://custom.simplemachines.org/mods/index.php?mod=999