[Exim] Mailer-Daemon and multiple domains ?

Afternoon All,

I'm stumped on a problem with error messages from Mailer-Daemon and multiple
domains.

I have an Exim 3x box supporting receipt and local delivery of a number of
domains. However all error messages, ie "From: Mailer-Daemon..." appear to
come solely from the 'qualify_domain'.

Now that's as expected, but I now need to make it that the mailer-daemon
message comes from the domain of the failed message. I was rather hoping that
a rewrite rule might come to my rescue with this. I can't, at the moment, find
anyway of rewriting based on a failed message report.

I do understand that there might be problems where there are multiple failed
recipients in different domains that the server handles, so how can it choose
which domain to be in, but I'll cross that bridge later. At this point a
'preferred' domain would be a good option.

If anybody can point me in the right direction I'd be grateful. I'd rather not
have to split the domains across multiple boxes just to avoid confusing users
:/

Thanks,
Jerry.
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