Failed delivery status

As of yesterday we are unable to receive messages from one of our vendors.  They keep getting the bounce back message I listed below.  Any help is appreciated.  Thanks!

This is a delivery status notification, automatically generated by MTA ******.com on Thu, 29 Mar 2007 15:09:58 -0500 Regarding recipient(s) : kline@*****.comcom Delivery status : Failed. None of the mail servers for the destination domain has so far responded. (*****.com).
We have been attempting delivery for 5 times.
Maximum delivery tries attempted. Please contact your administrator to contact the destination domain or resend your message. Delivery failed.
Message Information:
      Sender     : jane@*****.com
      Recipient  : kline@*****.com

MTA Response :4.4.1
The original message is included as attachment.
wolfhdAsked:
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SembeeCommented:
The message means what it says - their server, or the server doing the delivery cannot connect to your server. There could be any number of reasons for that, including things like a routing problem. However as the recipient your hands are tied on troubleshooting - it needs to be troubleshooted by the sender.
If the sender routes their email via an ISP then you will struggle to get assistance - most ISPs attitude is that there is nothing wrong with their network (even when there is and evidence can be produced).

Simon.
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