The way to do this is with a scrip. This page will show you how:
https://rt-wiki.bestpractical.com/wiki/SetActiveOnCustomerReply
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Sent from the Request
Why do you want to re-assign at all?
Assigning an Owner is a mechanism for ensuring that a ticket has someone
looking at it and working on it, and is responsible for making progress
towards a solution. Since you have an external roster that assigns
responsibility for work, this mechanism is
We use the Asset feature, having migrated to it from SYSAID.
I assume your powershell script will be used to build a CSV of all your
assets. You'll be able to import this CSV directly into Assets in RT. There
is a plugin to make this super easy: