Isn't all propaganda unofficial? It's not like there's a stamp on it ("This Propaganda was Approved by the Secretary of Media for the Islamic State"). Don't be fooled by that counterfit propaganda! Only buy the real deal!
Not at all. States can produce their own (and thus official) propaganda, but affiliates or supporters can do so on their own as well (unofficial).
When the ambassador of some country purchases advertising space in a national newspaper in the country they are stationed in and uses that to publish a letter or pamphlet, then that is likely officially sanctioned propaganda (the Chinese ambassador did this in the Netherlands to present the official Chinese view on certain matters related to China debated in Dutch media some years ago). That particular instance literally came with the stamp of approval (or rather the ambassador's signature).
