Auto reply in stead of Out of Office

Hi

We're running SBS server 2008 with exchange 2007.

We've got an dynamic IP address.  For this reason and for some kind of backup we've chosen to use the pop3 and smart host configuration in stead of working with MX records.

Our smart host (skynet.be) blocks the Out of Office messages due to the empty return path that is created by Exchange 2007.

Some research on the forum tells me that I should use Auto Reply in stead of Out of Office.

I've created a rule that replies to all messages send to me. Those messages are replyed with a specific text.

Now my problem : Nobody is receiving the auto reply messages. 

If I use the tracking tool I notice that the auto answer message is appearing as with a RECEIVE status in stead of a SEND status.

See example

Any help would be appreciated.

Regards

Stef

Stef