I have been testing your spam filter software on our server.  It works great with the exception that we cannot send e-mails to certain domains.  The ISP tries to communicate with our server via telnet to port 25 where spam filter picks up and responds with a bogus helo.  I have a hosted server with spam filter and merak mail server.  I am hosting about 12 different domains with about 7 different IP addresses.  Port 25 is being used by spam filter and redirected to port 26 on the same server to Merak Mail server.  Does it require me to configure Spam Filter a certain way to be able to give the right helo.  If I remove spam filter and just use the mail server on port 25 then I can send emails to these domains.  If I can't resolve this then I will not be able to purchase the spam filter server.  Can you help?