I dont receive it, but have received similar things and called immediately and bitched up a storm
You should consider a plain brown sleeve, and more people would sign up.
Even the FSC sent a magazine with porn ads on the back cover
Again, I'm certainly not opposed to the content (doh!), but I live among families with a gazillion kids who play outside even in zero degree weather, and my mailbox is small and magazines are *always* left hanging partway out.