First aid: Adjust your EMAIL notifications here Protected content - there you can eg. turn off an email informing you about 'Twinkles'
If done right you only get information about really important mails such as the monthly get together, changes of events you registered, etc.
If . . . if you THEN still get messages in your inbox you perceive as spam . . . then it it probably spam and you're fully entitled to report that to Munich and/or press 'abuse' buttun with a clarifying message.
What's your best trick to use the IN site in a smooth way ?