I love freecycle! We have gotten and given so many things that it has been amazing.
I think there is a way to filter out so you don't receive emails of all postings, I don't receive any emails from both groups I belong to, unless it is contact from someone I emailed or for my posts. Check with your group moderators to find out.
I belong to a group for the county I live in and one for a town close by. As for giving away coupons and things, I ask people to send me a SASE for small items, or big items, I ask for a money order and I will ship if the person wants it.
We don't have as many restrictions as some of the groups, thankfully!