After a few months of living in my current home, I still get packages and business mail addressed to the previous owners, who ran a home-based business. You'd think by now they would have notified their clients that they moved. I'm stuck having to call Fed-Ex and UPS to pick up the packages and return them to the senders. I can't even get in touch with the previous home owners because they did not leave a forwarding address. Grrrrrrrr
I used to live in an apt in upstate NY. I constantly got mail for the previous tenant, who apparently had financial issues (mail from collection agencies). She had abruptly left town. Annoying!
Last year we started getting mail addressed to someone who hadn't lived in this house for the best part of 20 years. The return address was a government agency.
I marked a couple of envelopes - they were coming about once or twice a week - with 'Not Known At This Address' and put them back in the post. The next ones, I actually readdressed manually to the return address, rather than just striking through my own address.
They kept coming. I gathered three together, and put them in a large envelope with a covering letter, pointing out that he didn't live here, hadn't done for years, that I didn't know where he did live, and that I had sent back several envelopes already. I paid postage on the envelope.
After that, once a fortnight for six weeks, I gathered together all the letters, put them in an envelope, attached a copy of my original letter with COPY
in a large font at the top and the dates of both the original letter and all subsequent ones also in bold and in red in the body of the text, and put them back in the post.
I didn't pay postage. In the UK, if a letter is addressed to you with inadequate postage, you have to pay not only the shortfall but also a small admin fee. You get a card telling you that there's an item to be collected, and you have to go to fetch it - it isn't brought with your mail.
Curiously, after the third envelope, the letters stopped.