> I tried what you said using your previous message as the test, the debug
> output is shown below. I notice that the reply message is generated with
> "Mail to: <default>" is this correct/should this be happening ?
This is incorrect (IMHO).
...
> Condition is true: personal
> Mail to: <default>
This COULD be an exim-bug, or an bug with the filter-testing or something
else, please try to use "mail to $reply_adress subject YOUR_SUBJECT"
ciao