We are a public sector organization that works closely with school
boards and other public sector organizations.
Our staff rely heavily on their vacation rules to inform their external
partners of their absences.

A large local school board rejects the vacation rule replies as
backscatter by their spam filter.

I have tried enabling this setting on the GWIA,
"Use GroupWise user address as Mail From: for rule generated messages"

But it doesn't appear to have made any difference to the message source.

Is there some way to have rule generated replies come from the recipient
of the original email and not the Postmaster?

I have not been able to find any information on this more recent than
GW7 or GW8.

Was running GW8sp2hp2 until recently.
Now running GW2012sp3.
Did see a difference between the two in this regard.