Hello.  Two very kind people responded with similar suggestions for solutions.  I have implemented the filter and am hoping for an inbox full of list serv emails!  

  1. In the search box at the top of your gmail, click the Down arrow
  2. Enter "highlandparkpa.com" in the search field.
  3. At the bottom of the search window, click Create filter with this search. 
  4. Choose what you’d like the filter to do. (never mark as spam)
  5. Click Create filter.

Or:

http://blog.kittycooper.com/2014/05/keeping-my-mailing-list-emails-out-of-gmails-spam-folder/