Unable to deliver due to being unable to connect successfully to the destination mail server.

This is the email address at Heathrow Airport "Mail My Property" the email address is the one they asked me to send my proforma page to after signing.  I cannot get it to them so they can send me my lost property.  Please help.  They have already charged my cc for the proper postage and I need this article back.   What do I need to do in order to get this to them.   Thank you:

This is an automatically generated Delivery Status Notification.

Unable to deliver message to the following recipients, due to being unable to connect successfully to the destination mail server.

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