new version of EHCP and still email problem

Finally I couldnt solve the problem for sending email anybody can send email from my sever without any authentication,

I installed fresh ubuntu, download latest version of ehcp and installed from the 0 but still everybody can send email!!!!

how can i stop it?

make sure you do not use more any ubuntu version higher then 10.04, because newer versions seem to not work well with ECHP.