how to give access to only gmail...and block others...

hi,

I need to know how to give access only to gmail from the router and block others. Even browsing should not take place.

Pls Help..

Thanks in advance…

Enable IP==>web Proxy

in ==> Access

add two allow rules mail.google.com and accounts.google.com allow
then deny all other.

also create IP DNAT rules to make it transparent proxy