When I post on the forums I get an email from the forums containing my post. I suspect this is because I've ticked "Do not suppress email notifications when I am active on the site". I do want email notifications of things that happen just after I've gone but I don't want notifications of my own actions.
You have
"Send me an email for every new post (unless I mute the topic or category)" checked ... aka mailing list mode.
We have a plan to allow you to address this with an additional setting. You can follow some discussion at meta