Opera Automatically Uploads Compatible Free Android Apps to Nokia X Store
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And it's very likely not pirating - it's uploading an app the developer already had in an Opera store to Nokia's store.
How Opera's system works is that it will automatically upload apps (the latest version it has that works against the runtime or whatever) to the new stores that appear. It used to automatically list them for download, but they got blowback from users and now you have to validate the account. Then whatever version you have in Opera's database will become available for Nokia X.
It's not a bad way to get compatible apps in a store. I understand users might be freaked out, but you can either not confirm the email or contact Opera/Nokia and decline having your app in their store. By signing Opera's ToS, they have extended distribution rights for your free apps.
edit: Author's comment: "It's not from Nokia, it comes from Opera.com (non-fake address according to gmail filters)." I think the title of the post is a bit misleading.
Also, what's the news here? Is this something more than a random scammer?
Maybe, Opera Automatically Uploads Compatible Free Android Apps to Nokia X Store?