Sometimes I get first class mail addressed to other people's names, at my address. I know I can't legally open it, or deliberately destroy it by putting it in the trash or shredding it. I know I could write "not at this address" on it and put it back into the mail system as outgoing mail.
Can I, while standing in front of my mailbox, simply stop holding it?
It would fall to the ground somewhere near my mailbox. It would not be immediately destroyed, and it would (weather permitting) be right there the next time the mail carrier comes by, and they would have an opportunity to see this wayward piece of mail, and pick it up, and deliver it to the person it is addressed to.
If it happened to rain before the mail carrier came, the mail might be damaged. And if it became windy it might be blown elsewhere; if it did not blow into the path of a mail carrier before it weathered into oblivion it could be destroyed. But it seems unusual to blame me for the actions of the weather on other people's stuff, unless I have some kind of obligation to care for it (and not merely no right to destroy it).
Do I have a positive legal obligation to act to get this mail to the addressee? Or can I decide to stop being involved in the life of this piece of first class mail as soon as I see it is not mine?
Does the answer depend on how long I can expect the mail to survive exposure to the elements, or how likely it is to still be there for the carrier to see the next time they come by?
I am particularly interested in my responsibilities r.e. protecting the mail from the elements or bringing it to the attention of the carrier, rather than just making sure it was available to them when I left it. If I drop it on the ground in a way that I know or ought to know will destroy it, that would be the same as just trashing it, which isn't allowed.