Deactivated OS-level notifications for @SlackHQ because they annoyed me a lot, now it sends me notifications with it's own UI... who came up with this and why? 
#badUXpic.twitter.com/Bk3aPZM8Nx
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Hey, thanks for your reply. I know I can turn notifications off there, _too_. But it seems a bad design choice to me that Slack resorts to it's own notification UI after I had already forbidden it from sending me system-level notifications.
You can turn off all Slack notifications in your Preferences by choosing "Notify me about..." > "Nothing". You can read more about notifications settings here:Thanks for clarifying, Ulrik. This is something that we're looking at, but in the meantime, if you'd like a workaround for this please write in to feedback@slack.com.
