do i have to have exchange server to access mail via ISA Server? i dial Internet to access pop and smtp mail. I do not have any problem in accessing my mail directly without ISA server. I'm also able to access my mail with MS Proxy server 2.0. i hav allowed full access i mean opened all ports on ISA Server. I'm able to access internet but not able to send and receive mails. i\m a newbie please help with details i have gone thru isaserver.org and all of this site but in vain.