Mail Rule/Script... seems like this would be easy....

[Ken Sp.]

I haven't looked into this at all--
Will it do that rule/Script to all email addresses?
If so, what about forwarding anything from that particular address to a certain new (gmail) address/Mailbox, and then telling that new mailbox to do the action to "everything" that comes to that mailbox, and since it is only the forwarded things from that certain email address, it should work