Gmail HTTPS Rule

Hi guys

Can anyone tell me is it possible to completely block all to and from communications over https (port 443) *except* for Gmail?

I've been trying to setup 2 general rules, one blocking https completely and the other one allowing only mail.google.com comms over that port, but i've been unable to make them work, no matter what is the higer ordered - gmail still gets blocked.

What am I doing wrong? Thanks.

 

p.s. using NIS09