In the old times I would just write it myself and a post office clerk would not check if it is a valid address. But since then there has been many changes due to war on drugs, war on terrorism, and what not..
How is it nowadays, are you allowed to send / ship anything without providing 1. a valid sender / return address and / or 2. ID.
Do they require the client themselves to provide such data, without validating it? Are there some cases when they do not require such data at all? How does the experience of you all differ across
different services (be they private or nationalized) and countries?