Post-carding

Does anyone else on this site enjoy post-carding? Are there any groups related to it that I can join?

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I even made a post about this. I even made other SW members trading cards that are suitable for mailing.

https://similarworlds.com/collectibles/5164045-Let-Have-SW-QSL-Trading-Cards-Say-you-made-a-friend-and-you

https://similarworlds.com/collectibles/5163893-Do-you-think-it-would-be-cool-if-SW-had-Trading-Cards-like

Here are some I made for other SW members