Sadly, no details were provided about the filter. This was the reply I received: “Hi there, I just approved your post as it was caught in Reddit‘s filters. Cheers.”

Just got a reply from the mods: the post was caught in Reddit’s filter, and they have now manually approved it.

That’s right, I have tried to post it also to Reddit, but I’ve got “Sorry, this post was removed by Reddit’s filters.” I have sent a message to the mods, now waiting for response.