I use to bulk email, my members, monthly with updates across the board but after one guy threatened to call the police on me, I just stopped. I'm pretty sure he was just saying that to get me to stop and not like he would get very far in taking legal action when he's the one that originally ticked the box to receive emails from the board. But, it just made me come to a point that if people really wanted to engage with the board, they'd log in themselves and enjoy the community. Yes, I did see an increase in traffic generally when I sent bulk emails, but this was just people viewing the board primarily and not posting.