John, can you simply clarify the rules/logic of your FBL with Yahoo!?
That will clarify this scenario considerably.
It's just like the IP based FBLs that other mail systems have, only
keyed on DK or DKIM d= signing domains rather than IP addresses. I
tell them what my d= domains are, they send reports when recipients
complain. I expect Paypal has the same arrangement with them. If you
don't, you should.
The terms of service are pretty typical, I can't redistribute the FBL
reports since they're unredacted, and I can use them for " (a)
reducing the incidences of your legitimate email being filtered by
Yahoo!'s spam filtering system or being marked as "spam" by Yahoo!
Mail users and (b) enforcing your spam policies."
You can see the TOS here:
http://feedbackloop.yahoo.net/tos.php
R's,
John
_______________________________________________
NOTE WELL: This list operates according to
http://mipassoc.org/dkim/ietf-list-rules.html