I have this weird problem where I (or a colleague) set up a Mastodon account years ago to post from an RSS feed, but I don't remember which service I used. In t

I have this weird problem where I (or a colleague) set up a Mastodon account years ago to post from an RSS feed, but I don't remember which service I used. In the Mastodon preferences, there are no "session" but me and no "application" either. Yet every time I update the RSS, it posts. I am really at a loss at how this was possibly set up.