Hotmail not receiving messages

I have used Hotmail (Live Mail) for a very long time but it stopped receiving messages on all three of my @matthews-us.com four days ago for reasons unknown.  I have read the discussions regarding this kind of problem and checked my filtering and blocked senders settings to insure they are not the cause.  One of my accounts also had a large number of messages in the inbox, sent, junk and deleted folders which I removed.  So far, nothing seems to work.  It is my belief that messages are being sent since they show up in the sent folder and early on some people indicated they had received messages to which they had replied.  In one (but not all) case they received a bounce back message.  I have also confirmed that I am unable to send a message to myself.