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Thanks Bill.
I had used that same approach, although incidently the format that worked for me was:
header:"X-Spam-known-sender:school"
...replacing single quotes with double and dropping the double quotes around the search term.
As you point out, that is only good for the emails received and not for those sent to members of a particular address book group.
The other problem with searching through the headers in the way you suggested, is that it won't find emails from members of the address book group if the sender was not in the group at the time of receipt. So if Jane is in my class at school and sends me an email about the chess club and I then add her address to the group, the chess club email will not appear in the results.
What I am asking for is perhaps a feature request, but if anyone has any further ideas they would be most welcome.
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