Delivery Status Notification

When we send an email to a particular company who have their own server (.co.uk)

We get this message back:-

from postmaster@he.local

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

The email address in the message is their old server ?????@btconnect.com NOT the email address sent to.

No-one seems to be able to understand what is happening as everyone else can send emails to them OK.