Problem forwarding messages from another email account into Hotmail

I have an email account with pil.net where the messages get forwarded automatically to my Hotmail (Outlook) account.  Suddenly none of those messages are coming in.  Everything is working perfectly on the other end.  I can speak directly with the owner at pil.net and he can see that the messages are getting properly funneled through and sent to Hotmail.  But they never actually arrive in my Hotmail inbox.  Was there some change in Hotmail and the way it handles incoming mail, or could there perhaps be some other issue?