You dont ever want to only allow certain emails. many people have numerous emails these days.
If you want to fight spam, disable the stop forum spam mod, and enable the human verification manager in admincp>settings and create a question. This will 99.9% stop spam. (The human spammer may get thru but the bots will not, and the human spam is easily dealt with)
The human verification manager is a much better easy to use tool then any stop spam mod around. *I have no bad thoughts for those mods, but there is little need for them when using the human verification manager.
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