isa 2006 is blocking my internal OWA https access

hello ,

I have basically configure my ISA 2006 server in a single network topology just to filter http,https traffic and works perfectly.

the problem is that ISA now is blocking my internal OWA -> https://mail.mydomain.com/exchange  and all the other internal https certificate internal sites

How can I bypass ISA for internal http and https sites?

thanks