I live in a small town 20kms from a large regional town. Our postman also collects the mail from the post boxes. We've had a once in a decade flood which has cut all roads (our little town is an island, but quite dry now), so no mail in or out for maybe another week. I'm still putting outgoing mail into the post box, which is well above the water line, and marking the sales as sent. I'm messaging buyers with details of the flooding and explaining that there will be at least a week's delay. Hopefully, they show a little compassion when it comes to leaving feedback!