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@steemitboard is a bit bumb.
It is notifying you on your last post, hence the accumulation of notification here.
Moreover, if you really want to disable notifications, you have to reply to it with "STOP" only, nothing else.
Silly bot 🙄

Merci @arcange! I guess it underlines how crucial it has become for me to post again a.s.a.p.! ;)

Namaste :)