[exim] sender_host_address in split queue scenario?

Hi list,

I run exim in a split queue setup (inbound daemon is queue only) along
with MailScanner. Is sender_host_address preserved or would the message
be considered locally submitted when picked up by the outbound daemon?
If it's not, what would be the best way for me to determine the IP of
the MTA that submitted the message? I'm unable to do something like
adding it as a header at the inbound stage because it is queue only