You may try this.
"Dear Colleagues (or) friends,
Our HR policies always aim at highest degree of employee satisfaction. We constantly take efforts to revive our Polices in order to yield good results matching the current trend. In this connection we are glad to share our revised HR Polices. This will come into effect with effect from ____. Please go through acknowledge read receipt of revised HR Policies. "
29th April 2019 From India, Madras