how to

[amadertouch]

i am getting lot of spammers they are make fake post ..how to avoid this ?
how to make a restriction for post ?i need to allow the members to create a new topic who is having 5 post count !

[mashby]

I think you might need an anti-spam mod so that you don't even get spammer members to begin with. I recommend this one:
http://custom.simplemachines.org/mods/index.php?mod=2932
Requires a little edit to the index.template.php file if you're using a custom theme.