Barney,
This is the "old style" of creating a reply address. Before internet addressing, we had to construct a sender's address like that so that the reply would make it back to GWIA.
What is wrong is that, for some reason, the GWIA does not think that internet addressing is on. This means:
1. There is a setup problem and internet addressing is not on for the system that contains this GWIA.
2. The startup switch is being used that disables internet addressing at the GWIA
3. The domain DB that the GWIA is on needs to be rebuilt.
Please check these items and let us know what you find.
Thanks,
Dean Lythgoe