When we moved into this town from the
city, the post office said "You have to use a post office box" we don't deliver to your street.
I said "Cool!"
It's caused the occasional problem with organizations/companies/governments not accepting the I only have a p.o. box address, but, especially in the winter, we've been enjoying having an excuse to stroll down to the post office every week day, and I think the dog enjoys it - when we're on non-post-office walks and reach the top of the p.o. street, she always looks down that way hopefully. There are always people around, picking up mail and packages and chatting with each other in the post office box "lobby."
I find that we get much less junk mail now. We do get a couple of ad drops a week at our door, because we're still in town and on the
newspaper routes, but in-box junk has become quite rare.
I've been cultivating penpals to varying degrees of intensity for about a decade and a half, and have about a dozen people from various parts of the world that send me letters and "stuff" with regularity - if you want to get letters etc., it's not hard to find
online resources - there are websites for collecting postcards, exchanging gifts, and clubs for making penpals - and I've had very few "creepy" experiences to date. Having a p.o. box to use instead of a street address makes it feel even more safe.
My partner has subscriptions to a couple of magazines - and we both order
books. So there's often a nice "surprise" when we check the mail!