Paid Hotmail Account – bouncing received emails with ‘non-existent address’

My Daughter just stared Kindergarten and it is important that I receive the school's emails.  I have not received emails from two recipients: *** Email address is removed for privacy *** and *** Email address is removed for privacy ***.  I have received all the messages from other email addresses at comcast.net and eagleschools.net.  I have been paying for hotmail for years and would greatly appreciate a response as I would really like to sort this out.  I don't have any rules set up for these email addresses.