Wow . That makes sense then!
I think if they go through a machine, it might cause an issue but if postal officers are stamping them, probably not.
To me that doesnāt make it very clear, but Iām willing to believe you - I never send square cards anyway, so I never really bothered to find out their postage. 
Oh, you donāt have to believe me, thatās up to you.
And maybe this makes it more clear for youā¦
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I received square card from Germany without envelope. The sender, which is an active forum member, used ā¬3.70 stamps. I was shocked seeing the stamps when I received the card. Very expensive 
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In Indonesia you can send shaped card with normal postage and without envelope as long as the weight is not more than 20 grams
I sent twice for postcrossing official and many times for tags and RRs
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Yes, unfortunately itās really expensive.
If you send a so-called āMaxi-Briefā which can be up to 1,000 g you have to pay 7 ā¬ for international mail. From 1,000 to 2,000 g 17 ā¬. And - you can only send documents, no goodies like tea bags etc. (of course you can try but if Deutsche Post suspects there could be other things but documents theyāll return the letter to you).
I stopped sending square or odd shaped postcards outside Germany in official Postcrossing (or send them in envelope but only cards who fit in a standard size envelope). Itās sad but in that case I prefer to send such cards better to member of RR or other forum members I know from RR or swaps.
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I didnāt know that, but I sent a postcard to Poland that arrived with normal international stamp (95 Cent).
DE-10859512
Maybe I was just lucky 
Now that I know, it would be too much of a risk to send them without envelope.
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Inside/From Finland you can send every sized and shaped postcards without envelope with the same amount of postage, as long as it is under 20 grams in internationally and under 50 grams in domestic mail.
But of course it is possible to use envelope, to protect cards for sorting machines. No difference of postage then.
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Actually, the NonMachinable stamp alone is valid for one ounce of non machinable domestic letter size mail (88 cents). For international, the same piece of mail would be $1.60 ($1.30 plus non machinable surcharge of 30 cents) so the HK card was overpaid.
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You are correct. However, Iāve encountered such a wide range of misininformed postal employees that I throw excess postage on as a sort of karmic insurance (no offense to postal workers, thereās a lot of info to know and Iām not sure the training covers some of the more unusual situations). Thereās a whole thread of people being incorrectly told a wooden postcard is a āpackageā and has to go at package rates.
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In Poland, you can send shaped cards as well as much larger than standard cards for the same price as while sending normal card. The same for this price we can send an envelope of any size stuffed with something, but it must be up to 50 grams. Above this weight, the different ranges begin and the price rises. So itās all about weight, not shape here (but only when it comes to shipments abroad, because there are already some restrictions on envelopes size in domestic mail). The minimum is 90 x 140 mm, but I have never measured anything and I have never tried to send anything smaller than a standard size of the card.
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I was wondering if anyone has sent a crossword-puzzle postcard? I have seen a couple of vintage ones at a local charity shop and was thinking of getting them, but I am a bit stumped about how to send them. (They are sealed in cellophane) I think I would have to put them whole into an envelope, as otherwise how would they not come apart in transit? Still, I think itās a fun ideaā¦!
Wow! this is an amazing postcard! I would like this very much! she is exclusive.
what interesting postcards. unusual and exclusive. their recipients are very lucky
I canāt find it anymore unfortunately
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what a pity. they are amazing
In the Netherlands, strangely there is no real size limit to any mail, as long as it fits through the mailbox (380 x 265 x 32 mm). So you can send anything you would like as long as it doesnāt exceed the weight limit for the stamp, you can send up to 2kg if you pay enough postage, but for the purpose of postcards, even the weirdest shaped cards should be good with just one international stamp, which is currently ā¬1,55.
With some of the responses, it reminded me of an episode of Mythbusters where an unwrapped coconut was sent to someone via mail.
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