So a mass email facility might not seem that special - however it is a great way of communicating with all current members without having to manage your own distribution lists or copying and pasting from spreadsheets!
Only members can send to other members - you have to use your registered email on your profile as all other emails are automatically blocked. So no spam.
There are no rules because you are grown-up and know how to appropriately send emails!
If you don't like an email for whatever reason, just hit the delete key! You can unsubscribe if you wish but you are likely to be missing out.