[exim] Anti SPAM Exim configuration

Dear Sirs.

Have anybody already tried to build such system as:

http://networksolutions.no-ip.com/services.php/mail/ecr ?

I remember I saw something of this kind, but can't remind where it
was. I would be very thankfull for any links on this topic.

Please, make a copy of your answer me directly. Thanks.

--
Alexander Prohorenko