u/Pleasant-Chance-6230

I found the white border around the picture a bit boring (the card was from a cheap set of 8 cards that I got at a 100 Yen shop when I started the hobby) so I added a few more sunflowers and shiba dogs. (I hope they also like dogs and daruma cats!)

I also heeded the advice I got the other day and also put the Japanese country name just to be extra sure.

For the statistics fans: The message text is 159 words long.

Thankfully I had a fitting card in my stash from a recent postcard haul.

I love the design of the back sides of those vintage cards. (This one is maybe from the 1980s?)
There's something about that green color of the text and the design elements like the drum with "Japan" written inside.

Luckily, I also had a fitting sticker with a JAL airplane.

A postcrosser had a picture of the so-called "Red Fuji" in his wish list (favorites), so I thought this would be the perfect chance to use this vintage commemorative stamp on the Summit Conference on Earthquake and Natural Disaster Countermeasures from 1991.

I recently posted about this card I put a lot of effort into that I sent off to a Postcrosser in Belarus.

To make sure it gets properly delivered, I even used my printer to print the provided address directly onto the envelope, so there's no error in the address.

The recipient is registering cards regularly, even some sent from Japan just as mine, so I think it's unlikely that the address is wrong.

As always when I use an envelope, I put my address on the back (in very small script), but I can't imagine it would get sent back as an accident. (Or could a machine have read the "from" address as the delivery address?)

The stamps were canceled normally, so I assume it went out of the country and was deliberately sent back from Belarus, but I can't understand why. The postage was enough (I re-checked several times).

Wouldn't there usually be a reason stated on the letter? (like "address unknown" or something like that?)

I guess it's possible that customs thought there might be something valuable inside that wasn't declared, but it's literally just pieces of cardboard which shouldn't have to be declared, right?

Has anybody happen something like this to them (recently)? Any thoughts or theories would be appreciated.

What would you do in this situation? Try to send it again in a new envelope?

I'm planning to ask at my local post office, too, but it's a very small one in a small city, so they probably will just say that they don't know...

Update:

I took it to my small post office where they told me I should try going to the main office of my city. (It's less than 10 minutes further away, so no big deal.)

The clerk said there seems to be nothing obviously wrong with it, so they will try to send it again as is. (The envelope was torn in one place on the bottom, so he said he'd tape that section.)

Thanks for everybody's answers and please keep your fingers crossed for my little card.