How to test internal hosting DNS for email issues

I wasn't sure how to title this one.
Here is the situation:
I used to have a hosted exchange account with Hostway until their customer service became so bad I couldn't take it anymore (been gone about a year). BUT, I do have a client that is still with them. Ever since I left, they cannot email me, the email always bounces back.

I have submitted many tickets to hostway but they don't have the brightest staff and always says its not their issue. My email address accepts emails from EVERY domain I have ever tried except those within Hostway.

Is there anyway I can "prove" that they have something wrong with their DNS or something like that?

Thanks!
Your message did not reach some or all of the intended recipients. Subject: test Sent: 5/27/2009 3:18 PM The following recipient(s) could not be reached: 
 
  usera@xxxxx.com on 5/27/2009 3:18 PM
  The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.
  <out.exchangecentral.net #5.1.1>

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rheideAsked:
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sykojesterSystems AdministratorCommented:
Is this the response they get when trying to send mail to YOU or when you try & send them mail?

out.exchangecentral.net seems to only send mail outbound as it does not even accept inbound connections on port 25 (SMTP).
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rheideAuthor Commented:
That was the response they get back when sending emails to me.

out.exchangecentral.net is owned by Hostway where my client has their account.

Is there a way to trace to see if the email ever leaves their network?
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BudDurlandDirector of ITCommented:
If you look at the full headers of the message (in Outlook, right click, choose options, in Thunderbird, press CTRL-U), you'll be able to trace what IP addresses the message has passed through.  If you are getting mail from other folks, I would suspect the Hostway still thinks that your domain is being hosted by them, and so is not doing an MX lookup to find you.
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