My understanding of the rules for sending out emailers is this..
1. they need to have subscribed to recieve your promotions etc..
2. you need to have an opt out button or way for them to sign off of your newsletter..
3. and you are suppost to have a phyical address at the bottom…
sue..
When they subscribe it’s called “opt-in”.
I prefer doing “double opt-in”, meaning I send out a note asking them to confirm the subscription. That eliminates names being submitted buy pranksters, or by evil wishers who just want to get you into trouble.
It has become quite difficult to run a respectable newsletter.